Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 7,222	$ (983)
Basic - weighted average common shares outstanding (in shares)	89,094	84,153
Dilutive effect of stock options and restricted stock awards (in shares)	2,637	0
Weighted average common shares outstanding - diluted (in shares)	91,731	84,153
Income (loss) per common share - basic (in dollars per share)	$ 0.08	$ (0.01)
Income (loss) per common share - diluted (in dollars per share)	$ 0.08	$ (0.01)
Stock options and restricted stock excluded from calculation of diluted earnings per share because anti-dilutive for the period (in shares)	1,654	8,083
Convertible debt \| Convertible Notes due 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and restricted stock excluded from calculation of diluted earnings per share because anti-dilutive for the period (in shares)	0	7,569
Convertible debt \| Convertible Notes due 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of Convertible 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 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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