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Equity Instruments and Stock Based Compensation - Stock Options (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Stock Options, Outstanding [Roll Forward]  
Stock options outstanding, beginning balance (in shares) | shares 5,041
Granted (in shares) | shares 138
Exercised (in shares) | shares (82)
Forfeited (in shares) | shares (428)
Expired (in shares) | shares (68)
Stock options outstanding, ending balance (in shares) | shares 4,601
Stock options exercisable (in shares) | shares 3,005
Stock Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Stock options outstanding, beginning balance (in usd per share) | $ / shares $ 11.34
Granted (in usd per share) | $ / shares 6.67
Exercised (in usd per share) | $ / shares 6.52
Forfeited (in usd per share) | $ / shares 10.04
Expired (in usd per share) | $ / shares 12.41
Stock options outstanding, ending balance (in usd per share) | $ / shares 11.39
Stock options exercisable (in usd per share) | $ / shares $ 11.99
Stock options outstanding, Weighted Average Remaining Contractual Life (in years) 7 years 3 months
Stock options exercisable, Weighted Average Remaining Contractual Life (in years) 6 years 7 months 28 days
Stock options outstanding, Aggregate Intrinsic Value | $ $ 0
Stock options exercisable, Aggregate Intrinsic Value | $ $ 0