Comprehensive Income (Loss) - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss, beginning of period	$ (47,229)	$ (28,118)
Foreign currency translation adjustments	(1,976)	(1,830)	$ (536)
Other comprehensive loss, net of tax, before reclassifications	(1,976)	(1,830)
Adjustment to pension liability, net of tax	5,645	(17,281)	22,152
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	5,645	(17,281)
Other comprehensive income	3,669	(19,111)	21,616
Accumulated other comprehensive loss, end of period	(43,560)	(47,229)	(28,118)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss, beginning of period	(49,560)	(32,279)
Adjustment to pension liability, net of tax	5,645	(17,281)
Other comprehensive income	5,645	(17,281)
Accumulated other comprehensive loss, end of period	(43,915)	(49,560)	(32,279)
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive loss, beginning of period	2,331	4,161
Foreign currency translation adjustments	(1,976)	(1,830)
Other comprehensive income	(1,976)	(1,830)
Accumulated other comprehensive loss, end of period	$ 355	$ 2,331	$ 4,161