Stockholders' Equity (Other Comprehensive Income (Loss) Net of Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ (259,392)
Current period loss	(7,615)
Balance at end of period	(267,007)	$ (259,392)
OCI Income (loss)	(3,000)	13,800	$ 31,900
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(3,577)
Current period loss	(2,232)
Balance at end of period	(5,809)	(3,577)
Net Pension and Other Benefit Obligations
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(255,815)
Current period loss	(5,383)
Balance at end of period	$ (261,198)	$ (255,815)