Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0001325955 (http://www.sec.gov/CIK)

Equity [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Equity [Abstract]
Schedule of Common Stock Outstanding Roll Forward	For the years ended December 31, 2016, 2015 and 2014, activity in the number of common stock outstanding was as follows:   Common Stock   (in thousands) Balance as of December 31, 2013 68,641 Shares issued in connection with stock plans 304 Shares issued for payment of preferred stock dividends 3 Shares issued in connection with amended shareholder agreement 659 Balance as of December 31, 2014 69,607 Shares issued in connection with stock plans 693 Shares issued for payment of preferred stock dividends 1 Shares issued in connection with preferred share conversions 101 Shares issued in connection with amended shareholder agreement 558 Balance as of December 31, 2015 70,960 Shares issued in connection with stock plans 153 Shares issued in connection with amended shareholder agreement 465 Balance as of December 31, 2016 71,578
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table displays the change in accumulated other comprehensive loss, net of tax:   Unrealized Gain (Loss) on Cash Flow Hedges   Postretirement Benefit Plans   Total Balance at December 31, 2015 $ (1,357 )   $ (27,451 )   $ (28,808 ) Other comprehensive income (loss) before reclassifications (348 )   571   223 Amounts reclassified from accumulated other comprehensive income (loss) 476   1,998   2,474 Net current-period other comprehensive income 128   2,569   2,697 Balance at December 31, 2016 $ (1,229 )   $ (24,882 )   $ (26,111 )