Weighted Average Shares Outstanding and Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Weighted Avg Shares Outstanding and Earnings Per Share [Line Items]
Net loss allocated to common shareholders for basic calculation		$ (23,790)	$ (10,441)
Weighted average common shares outstanding, basic		39,649	39,433
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	[1]	0	0
Weighted average common shares outstanding, diluted		39,649	39,433
Basic (in dollars per share)		$ (0.60)	$ (0.26)
Diluted (in dollars per share)		$ (0.60)	$ (0.26)
Antidilutive shares		673	544

[1] Due to the net loss for the three months ended March 31, 2017 and 2016, restricted stock units and common stock options representing approximately 673,000 and 544,000, respectively, have been excluded from the number of shares used in calculating diluted net loss per share, as their inclusion would be antidilutive.