Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 8,805	$ (4,299)	$ 11,311	$ 19,983	$ 15,976	$ 3,284	$ 15,817	$ 39,243
Weighted-average shares outstanding — basic (in shares)	42,802			41,771			42,606	41,283
Weighted-average shares outstanding — diluted (in shares)	43,691			43,052			43,651	42,796
Net income per share - basic (in dollars per share)	$ 0.21			$ 0.48			$ 0.37	$ 0.95
Net income per share - diluted (in dollars per share)	$ 0.20			$ 0.46			$ 0.36	$ 0.92
Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities (in shares)	889			1,281			1,045	1,513
Anti-dilutive weighted-average shares (in shares)	2,328			1,060			2,076	832
Convertible Senior Notes and Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities (in shares)	0			0			0	0
Anti-dilutive weighted-average shares (in shares)	11,816			0			11,816	0