Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 32,194	$ 61,338	$ 37,729
Weighted-average shares outstanding — basic (in shares)	42,583	41,462	39,242
Weighted-average shares outstanding — diluted (in shares)	43,743	42,943	40,559
Net income per share - basic (in dollars per share)	$ 0.76	$ 1.48	$ 0.96
Net income per share - diluted (in dollars per share)	$ 0.74	$ 1.43	$ 0.93
Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities from stock award plans (in shares)	1,160	1,481	1,317
Anti-dilutive weighted-average shares related to stock award plans (in shares)	2,054	926	1,279
Convertible Debt Securities and Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities from stock award plans (in shares)	0	0	0
Anti-dilutive weighted-average shares related to stock award plans (in shares)	11,816	0	0