Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Accumulated Deficit	Accumulated Other Comprehensive Income (loss)
Beginning balance, shares at Dec. 31, 2013		29,198,000
Beginning balance at Dec. 31, 2013	$ 81,136	$ 309,370	$ (229,090)	$ 856
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to benefit plans, shares		281,000
Shares issued pursuant to benefit plans	635	$ 635
Stock based compensation associated with employee benefit plans	4,097	$ 4,097
Vesting of restricted stock units, shares		709,000
Restricted share forfeitures for tax settlements, shares		(211,000)
Restricted share forfeitures for tax settlements	(629)	$ (629)
Net adjustment for fair value of hedge derivatives, net of taxes	123			123
Translation adjustments	(556)			(556)
Issuance of common stock, shares		6,555,000
Issuance of common stock	20,551	$ 20,551
Net income (loss)	(27,581)			0
Ending balance, shares at Dec. 31, 2014		36,532,000
Ending balance at Dec. 31, 2014	77,776	$ 334,024	(256,671)	423
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to benefit plans, shares		205,000
Shares issued pursuant to benefit plans	331	$ 331
Stock based compensation associated with employee benefit plans	3,952	$ 3,952
Vesting of restricted stock units, shares		279,000
Restricted share forfeitures for tax settlements, shares		(57,000)
Restricted share forfeitures for tax settlements	(142)	$ (142)
Net adjustment for fair value of hedge derivatives, net of taxes	(67)			(67)
Translation adjustments	(1,255)			(1,255)
Net income (loss)	$ (14,678)
Ending balance, shares at Dec. 31, 2015	36,959,000	36,959,000
Ending balance at Dec. 31, 2015	$ 65,917	$ 338,165	(271,349)	(899)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to benefit plans, shares	319,000	393,000
Shares issued pursuant to benefit plans	$ 1,040	$ 1,040
Stock based compensation associated with employee benefit plans	3,797	$ 3,797
Vesting of restricted stock units, shares		1,799,000
Restricted share forfeitures for tax settlements, shares		(630,000)
Restricted share forfeitures for tax settlements	(3,287)	$ (3,287)
Net adjustment for fair value of hedge derivatives, net of taxes	292			292
Translation adjustments	(952)			(952)
Net income (loss)	$ (10,251)
Ending balance, shares at Dec. 31, 2016	38,521,000	38,521,000
Ending balance at Dec. 31, 2016	$ 56,556	$ 339,715	$ (281,600)	$ (1,559)