Schedule of Long-term Debt Instruments | Long-term debt consisted of the following: | | | | | | | | | | December 31, | | 2016 | | 2015 | 5.45% Notes due 2016 | | $ | — |
| | $ | 250,000 |
| 1.50% Notes due 2016 | | — |
| | 250,000 |
| 1.60% Notes due 2018 | | 300,000 |
| | 300,000 |
| 4.125% Notes due 2020 | | 350,000 |
| | 350,000 |
| 8.8% Debentures due 2021 | | 84,715 |
| | 84,715 |
| 2.625% Notes due 2023 | | 250,000 |
| | 250,000 |
| 3.20% Notes due 2025 | | 300,000 |
| | 300,000 |
| 2.30% Notes due 2026 | | 500,000 |
| | — |
| 7.2% Debentures due 2027 | | 193,639 |
| | 193,639 |
| 3.375% Notes due 2046 | | 300,000 |
| | — |
| Lease obligations | | 83,619 |
| | 82,747 |
| Net impact of interest rate swaps, debt issuance costs and unamortized debt discounts | | (14,275 | ) | | (4,087 | ) | Total long-term debt | | 2,347,698 |
| | 2,057,014 |
| Less—current portion | | 243 |
| | 499,923 |
| Long-term portion | | $ | 2,347,455 |
| | $ | 1,557,091 |
|
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Schedule of Maturities of Long-term Debt | Aggregate annual maturities of long-term debt are as follows for the years ending December 31: | | | | | 2017 | $ | 243 |
| 2018 | 300,279 |
| 2019 | 367 |
| 2020 | 350,462 |
| 2021 | 85,279 |
| Thereafter | 1,611,068 |
|
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Schedule Of Net Interest Expense | Net interest expense consisted of the following: | | | | | | | | | | | | | | For the years ended December 31, | | 2016 | | 2015 | | 2014 | Interest expense | | $ | 97,851 |
| | $ | 93,520 |
| | $ | 93,777 |
| Capitalized interest | | (5,903 | ) | | (12,537 | ) | | (6,179 | ) | Loss on extinguishment of debt | | — |
| | 28,326 |
| | — |
| Interest expense | | 91,948 |
| | 109,309 |
| | 87,598 |
| Interest income | | (1,805 | ) | | (3,536 | ) | | (4,066 | ) | Interest expense, net | | $ | 90,143 |
| | $ | 105,773 |
| | $ | 83,532 |
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