Stockholders' Equity (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Apr. 28, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Payments for repurchase of stock	$ 0	$ 108
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(267,007)
Current period income	1,517
Ending balance	(265,490)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(5,809)
Current period income	1,420
Ending balance	(4,389)
Net Pension and Other Benefit Obligations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(261,198)
Current period income	97
Ending balance	$ (261,101)
2016 Stock Repurchase Program [Member] | Common Stock
Accumulated Other Comprehensive Income (Loss) [Line Items]
Number of shares authorized to be repurchased (in shares)			500,000
Stock repurchased during period (in shares)	15,019
Payments for repurchase of stock	$ 400