Accumulated Other Comprehensive Income (Loss) Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	$ (152,193)	$ (140,363)
Other comprehensive loss before reclassifications	(12,700)	(6,369)
Amounts reclassified from accumulated other comprehensive income (net of tax $(7,524) and $(7,183))	11,819	11,283
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	(7,524)	(7,183)
Actuarial gain (loss), (net of tax $23,785 and $10,660)	(37,361)	(16,744)
Net Unamortized Gain (Loss) Arising During Period, Tax	23,785	10,660
Net current-period other comprehensive (loss) income	(38,242)	(11,830)
Ending Balance December 31,	(190,435)	(152,193)
Foreign Currency
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	284	6,653
Other comprehensive loss before reclassifications	(12,700)	(6,369)
Amounts reclassified from accumulated other comprehensive income (net of tax $(7,524) and $(7,183))	0	0
Actuarial gain (loss), (net of tax $23,785 and $10,660)	0	0
Net current-period other comprehensive (loss) income	(12,700)	(6,369)
Ending Balance December 31,	(12,416)	284
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	(152,477)	(147,016)
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (net of tax $(7,524) and $(7,183))	11,819	11,283
Actuarial gain (loss), (net of tax $23,785 and $10,660)	(37,361)	(16,744)
Net current-period other comprehensive (loss) income	(25,542)	(5,461)
Ending Balance December 31,	$ (178,019)	$ (152,477)