Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic and diluted net loss per common share calculation:
Net loss	$ (22,204)	$ (29,945)	$ (65,326)	$ (66,246)
Weighted average common shares outstanding - basic and diluted (in shares)	35,858	35,392	35,831	35,324
Net loss per share of common stock - basic and diluted (in dollars per share)	$ (0.62)	$ (0.85)	$ (1.82)	$ (1.88)
Anti-dilutive securities
Total (in shares)	4,340	4,245	4,340	4,245
Stock options outstanding
Anti-dilutive securities
Total (in shares)	3,805	3,584	3,805	3,584
Restricted stock units
Anti-dilutive securities
Total (in shares)	535	661	535	661

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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