Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Computation of basic and diluted net loss per share [Abstract]
Net (loss) income	$ (17,210)	$ 1,804	$ (30,483)	$ 6,423
Denominator for basic earnings per share - weighted average shares (in shares)	106,942,429	105,694,789	106,885,893	104,522,051
Effect of dilutive securities: Stock options and restricted stock outstanding (in shares)	1,611,959	5,412,304	1,203,886	7,333,492
Denominator for diluted earnings per share - weighted average shares adjusted for dilutive securities (in shares)	106,942,429	111,107,093	106,885,893	111,855,543
(Loss) income per common share - basic (in dollars per share)	$ (0.16)	$ 0.02	$ (0.29)	$ 0.06
(Loss) Income per common share - diluted (in dollars per share)	$ (0.16)	$ 0.02	$ (0.29)	$ 0.06
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,611,959	5,412,304	1,203,886	7,333,492
Outstanding Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	878,134	5,138,145	792,760	6,120,498
Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	733,825	274,159	411,126	1,212,994

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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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