Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Shares	Treasury Shares	Preferred Stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Loss
Treasury Stock, Common, Shares			(62)
Stockholders' Equity Attributable to Parent at Dec. 31, 2013	$ 388,461	$ 234	$ (767)		$ 223,893	$ 183,844	$ (18,743)
Balance (in shares) at Dec. 31, 2013		23,471		0
Comprehensive Loss:
Net loss	(119,388)					(119,388)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(5,377)						(5,377)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(12,996)						(12,996)
Long-term incentive plan	1,456				1,456
Exercise of stock options and other	493	$ 2	$ (113)		604
Exercise of stock options and other (in shares)		159	(9)
Stockholders' Equity Attributable to Parent at Dec. 31, 2014	252,649	$ 236	$ (880)		225,953	64,456	(37,116)
Balance (in shares) at Dec. 31, 2014		23,630		0
Treasury Stock, Common, Shares			(71)
Comprehensive Loss:
Net loss	(209,765)					(209,765)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(6,642)						(6,642)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	9,937						9,937
Long-term incentive plan	149				149
Exercise of stock options and other	660	$ 2	$ (84)		742
Exercise of stock options and other (in shares)		258	(23)
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	46,988	$ 238	$ (964)		226,844	(145,309)	(33,821)
Balance (in shares) at Dec. 31, 2015		23,888		0
Treasury Stock, Common, Shares			(94)
Comprehensive Loss:
Net loss	(107,982)					(107,982)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	494						494
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	7,388						7,388
Stock Issued During Period, Shares, Conversion of Convertible Securities		8,576
Stock Issued During Period, Value, Conversion of Convertible Securities	16,629	$ 86			16,543
Adjustments to Additional Paid in Capital, Warrant Issued	200				200
Long-term incentive plan	882				882
Exercise of stock options and other	274	$ 3	$ (85)		356
Exercise of stock options and other (in shares)		304	(108)
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	$ (35,127)	$ 327	$ (1,049)		$ 244,825	$ (253,291)	$ (25,939)
Balance (in shares) at Dec. 31, 2016		32,768		0
Treasury Stock, Common, Shares			(202)