| Income Tax Disclosure [Abstract] | Period [Axis] |
|---|
2016-01-01 - 2016-12-31 |
|---|
Income Tax Disclosure [Abstract] | |
Components Of Income Before Income Taxes | Income before income taxes includes the following components: | | | | | | | | | | | | | | | | Year Ended December 31, | (in thousands) | | 2016 | | 2015 | | 2014 | Domestic | | $ | 340,251 |
| | $ | 325,097 |
| | $ | 291,042 |
| Foreign | | 40,064 |
| | 31,668 |
| | 57,097 |
| Total | | $ | 380,315 |
| | $ | 356,765 |
| | $ | 348,139 |
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Components Of Provision For Income Taxes | The provision for income taxes is composed of the following: | | | | | | | | | | | | | | | | Year Ended December 31, | (in thousands) | | 2016 | | 2015 | | 2014 | Current: | | | | | | | Federal | | $ | 99,783 |
| | $ | 93,853 |
| | $ | 80,620 |
| State | | 8,338 |
| | 7,733 |
| | 7,192 |
| Foreign | | 17,479 |
| | 17,854 |
| | 24,495 |
| Deferred: | | | | | | | Federal | | (13,368 | ) | | (14,472 | ) | | (18,536 | ) | State | | (1,036 | ) | | (1,987 | ) | | (1,915 | ) | Foreign | | 3,483 |
| | 1,263 |
| | 1,593 |
| Total | | $ | 114,679 |
| | $ | 104,244 |
| | $ | 93,449 |
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Reconciliation Of U.S. Federal Statutory Tax Rate To Consolidated Effective Tax Rate | The reconciliation of the U.S. federal statutory tax rate to the consolidated effective tax rate is as follows: | | | | | | | | | | | | | Year Ended December 31, | | | 2016 | | 2015 | | 2014 | Federal statutory tax rate | | 35.0 | % | | 35.0 | % | | 35.0 | % | State income taxes, net of federal benefit | | 1.6 |
| | 1.1 |
| | 1.2 |
| Uncertain tax positions | | (0.2 | ) | | (0.4 | ) | | (0.9 | ) | Research and development credits | | (1.0 | ) | | (1.1 | ) | | (1.1 | ) | Benefit from restructuring activities | | (2.2 | ) | | (2.7 | ) | | (4.1 | ) | Domestic production activity benefit | | (3.7 | ) | | (3.1 | ) | | (3.5 | ) | Other | | 0.7 |
| | 0.4 |
| | 0.2 |
| | | 30.2 | % | | 29.2 | % | | 26.8 | % |
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Components Of Deferred Tax Assets And Liabilities | The components of deferred tax assets and liabilities are as follows: | | | | | | | | | | | | December 31, | (in thousands) | | 2016 | | 2015 | Deferred tax assets: | | | | | Net operating loss carryforwards | | $ | 32,969 |
| | $ | 40,939 |
| Stock-based compensation | | 23,652 |
| | 23,258 |
| Employee benefits | | 17,187 |
| | 17,044 |
| Uncertain tax positions | | 11,562 |
| | 10,233 |
| Deferred revenue | | 6,382 |
| | 8,603 |
| Research and development credits | | 3,889 |
| | 3,562 |
| Allowance for doubtful accounts | | 2,078 |
| | 1,888 |
| Other | | 3,163 |
| | 3,240 |
| Valuation allowance | | (1,625 | ) | | (603 | ) | | | 99,257 |
| | 108,164 |
| Deferred tax liabilities: | | | | | Other intangible assets | | (56,195 | ) | | (73,933 | ) | Property and equipment | | (2,994 | ) | | (3,426 | ) | | | (59,189 | ) | | (77,359 | ) | Net deferred tax assets | | $ | 40,068 |
| | $ | 30,805 |
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Reconciliation Of Unrecognized Tax Benefits | The following is a reconciliation of the total amounts of unrecognized tax benefits: | | | | | | | | | | | | | | | | Year Ended December 31, | (in thousands) | | 2016 | | 2015 | | 2014 | Unrecognized tax benefit as of January 1 | | $ | 16,067 |
| | $ | 16,342 |
| | $ | 19,590 |
| Gross increases—tax positions in prior period | | 983 |
| | 64 |
| | 488 |
| Gross decreases—tax positions in prior period | | (2,502 | ) | | (850 | ) | | (3,715 | ) | Gross increases—tax positions in current period | | 2,725 |
| | 4,064 |
| | 2,513 |
| Reductions due to a lapse of the applicable statute of limitations | | (927 | ) | | (2,808 | ) | | (1,924 | ) | Changes due to currency fluctuation | | (348 | ) | | (653 | ) | | (610 | ) | Settlements | | (789 | ) | | (92 | ) | | — |
| Unrecognized tax benefit as of December 31 | | $ | 15,209 |
| | $ | 16,067 |
| | $ | 16,342 |
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