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Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Comprehensive Income (Loss)
Net income (loss)	$ 10,089	$ 6,420	$ 5,637	$ 1,845	$ 6,566	$ (8,173)	$ 8,309	$ 6,668	$ 23,991	$ 13,370	$ (83,353)
Other comprehensive income (loss):
Adjustment to pension liability									(28,802)	36,920	(9,544)
Tax (expense) benefit									11,521	(14,768)	3,818
Adjustment to pension liability, net of tax									(17,281)	22,152	(5,726)
Foreign currency translation adjustments									(1,830)	(536)	1,315
Total other comprehensive income (loss), net of tax									(19,111)	21,616	(4,411)
Comprehensive income (loss)									4,880us-gaap_ComprehensiveIncomeNetOfTax	34,986us-gaap_ComprehensiveIncomeNetOfTax	(87,764)us-gaap_ComprehensiveIncomeNetOfTax
Accumulated other comprehensive income
Balance at beginning of period				(28,118)				(49,734)	(28,118)	(49,734)
Other comprehensive income (loss), net of tax, before reclassifications									(1,830)	(536)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax									(17,281)	22,152
Net current period other comprehensive income (loss), net of tax									(19,111)	21,616	(4,411)
Balance at end of period	(47,229)				(28,118)				(47,229)	(28,118)	(49,734)
Accumulated Defined Benefit Plans Adjustment
Accumulated other comprehensive income
Balance at beginning of period				(32,279)				(54,431)	(32,279)	(54,431)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax									(17,281)	22,152
Net current period other comprehensive income (loss), net of tax									(17,281)	22,152
Balance at end of period	(49,560)				(32,279)				(49,560)	(32,279)
Accumulated Translation Adjustment
Accumulated other comprehensive income
Balance at beginning of period				4,161				4,697	4,161	4,697
Other comprehensive income (loss), net of tax, before reclassifications									(1,830)	(536)
Net current period other comprehensive income (loss), net of tax									(1,830)	(536)
Balance at end of period	$ 2,331				$ 4,161				$ 2,331	$ 4,161