Accumulated Other Comprehensive Income (Loss) Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	$ (140,363)	$ (166,814)
Other comprehensive loss before reclassifications	(6,369)	(5,387)
Amounts reclassified from accumulated other comprehensive income (net of tax $(7,183) and $(10,643))	11,283	16,716
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	(7,183)	(10,643)
Actuarial gain (loss), (net of tax $10,660 and $(9,627))	(16,744)	15,122
Net Unamortized Gain (Loss) Arising During Period, Tax	10,660	(9,627)
Net current-period other comprehensive (loss) income	(11,830)	26,451
Ending Balance December 31,	(152,193)	(140,363)
Foreign Currency
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	6,653	12,040
Other comprehensive loss before reclassifications	(6,369)	(5,387)
Amounts reclassified from accumulated other comprehensive income (net of tax $(7,183) and $(10,643))	0	0
Actuarial gain (loss), (net of tax $10,660 and $(9,627))	0	0
Net current-period other comprehensive (loss) income	(6,369)	(5,387)
Ending Balance December 31,	284	6,653
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	(147,016)	(178,854)
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (net of tax $(7,183) and $(10,643))	11,283	16,716
Actuarial gain (loss), (net of tax $10,660 and $(9,627))	(16,744)	15,122
Net current-period other comprehensive (loss) income	(5,461)	31,838
Ending Balance December 31,	$ (152,477)	$ (147,016)