Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic - net loss	$ (983)	$ (13,300)
Assumed conversions of Convertible Notes due 2017	0	0
Diluted - adjusted net loss	$ (983)	$ (13,300)
Weighted average number of common shares outstanding - basic (in shares)	84,153	83,258
Dilutive effect of stock options and restricted stock awards (in shares)	0	0
Weighted average common shares outstanding - diluted (in shares)	84,153	83,258
Basic (loss) per common share (in dollars per share)	$ (0.01)	$ (0.16)
Diluted (loss) per common share (in dollars per share)	$ (0.01)	$ (0.16)
Stock options and restricted stock excluded from calculation of diluted earnings per share because anti-dilutive for the period (in shares)	8,083	6,265
Convertible debt \| Convertible Notes due 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of Senior Notes (in shares)	0	0
Stock options and restricted stock excluded from calculation of diluted earnings per share because anti-dilutive for the period (in shares)	7,569	15,280
Convertible debt \| Convertible Notes due 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of Senior Notes (in shares)	0	0
Stock options and restricted stock excluded from calculation of diluted earnings per share because anti-dilutive for the period (in shares)	0	0
Senior notes \| Convertible Notes due 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt instrument, convertible, conversion price (in dollars per share)			$ 11
Senior notes \| Convertible Notes due 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt instrument, convertible, conversion price (in dollars per share)			$ 9.33

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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