Quarterly Financial Summary (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 154,000	$ 98,248	$ 78,014	$ 88,541	$ 85,909	$ 79,133	$ 82,127	$ 74,616	$ 418,803	$ 321,785	$ 286,270
Income (loss) from operations before income taxes	13,387	(43)	1,999	10,751	9,805	3,429	9,220	3,395	26,094	25,849	16,664
Net income (loss)	$ 9,381	$ (267)	$ 531	$ 8,107	$ 7,071	$ 2,642	$ 6,689	$ 2,420	$ 17,752	$ 18,822	$ 10,013
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.50	$ (0.01)	$ 0.03	$ 0.5	$ 0.48	$ 0.18	$ 0.45	$ 0.16	$ 0.98	$ 1.27	$ 0.62
Diluted (in dollars per share)	$ 0.50	$ (0.01)	$ 0.03	$ 0.49	$ 0.47	$ 0.18	$ 0.45	$ 0.16	$ 0.97	$ 1.25	$ 0.62