Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator [Abstract]
Net income (loss)	$ 7,195		$ (46,937)	$ 20,885	$ (87,817)
Denominator [Abstract]
Denominator for basic earnings per share – weighted-average common shares outstanding (shares)	162,357,000	158,259,000	116,120,000	158,259,000	110,415,000
Effect of dilutive securities: Stock options and restricted shares (shares)	1,448,000		0	1,683,000	0
Dilutive potential common shares [Abstract]
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed exercise of options, restricted shares and warrants (in shares)	163,805,000		116,120,000	159,942,000	110,415,000
Earnings Per Share, Basic [Abstract]
Net income (loss) per common share - basic (in usd per share	$ 0.04		$ (0.40)	$ 0.13	$ (0.80)
Earnings Per Share, Diluted [Abstract]
Net income (loss) per common share - diluted (in usd per share)	$ 0.04		$ (0.40)	$ 0.13	$ (0.80)
Stock options excluded from the calculation of diluted income (loss) per share (in shares)	1,712				1,675

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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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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