Loss Per Share - Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Class of Stock [Line Items]
Net loss - Basic and Diluted	$ (2,280)	$ (12,547)	$ (32,465)	$ (14,062)
Weighted average common shares outstanding - Basic (in shares)	54,910	54,264	54,827	54,356
Assumed conversions:
Weighted average common shares outstanding - Diluted (in shares)	54,910	54,264	54,827	54,356
Basic loss per common share (in dollars per share)	$ (0.04)	$ (0.23)	$ (0.59)	$ (0.26)
Diluted loss per common share (in dollars per share)	$ (0.04)	$ (0.23)	$ (0.59)	$ (0.26)
Stock Options [Member]
Assumed conversions:
Incremental common shares from stock options and restricted stock units (in shares)	0	0	0	0
Restricted Stock Units [Member]
Assumed conversions:
Incremental common shares from stock options and restricted stock units (in shares)	0	0	0	0