Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 204,570	$ 149,508	$ 131,065	$ 126,642	$ 198,166	$ 171,301	$ 135,583	$ 125,032
Gross profit	42,397	30,946	28,507	26,702	41,993	38,404	30,727	27,928	$ 55,209	$ 58,655	$ 86,155	$ 97,059	$ 128,552	$ 139,052	$ 136,117
Operating profit	19,060	4,439	3,185	111	16,050	11,763	3,944	1,794	3,296	5,738	7,734	17,501	26,794	33,550	37,956
Income (loss) from continuing operations, net of tax	13,304	553	1,898	(662)	11,490	9,030	1,645	894	1,236	2,539	1,789	11,569	15,093	23,059	18,109
Loss from discontinued operations, net of tax	(20,608)	(2,753)	(2,516)	(2,723)	2,371	(1,889)	(2,766)	(3,077)	(5,239)	(5,843)	(7,992)	(7,732)	(28,600)	(5,361)	(2,225)
Net income (loss)	$ (7,304)	$ (2,200)	$ (618)	$ (3,385)	$ 13,861	$ 7,141	$ (1,121)	$ (2,183)	$ (4,003)	$ (3,304)	$ (6,203)	$ 3,837	$ (13,507)	$ 17,698	$ 15,884
Earnings Per Share, Basic and Diluted [Abstract]
Basic and diluted earnings per share, continuing operations (in dollars per share)	$ 0.98	$ 0.04	$ 0.14	$ (0.05)	$ 0.84	$ 0.66	$ 0.12	$ 0.07	$ 0.09	$ 0.19	$ 0.13	$ 0.84	$ 1.10	$ 1.68	$ 1.32
Basic and diluted earnings per share, discontinued operations (in dollars per share)	(1.52)	(0.20)	(0.18)	(0.20)	0.17	(0.14)	(0.20)	(0.22)	$ (0.38)	$ (0.43)	$ (0.58)	$ (0.56)	$ (2.09)	$ (0.39)	$ (0.16)
Basic earnings (loss) per share (in dollars per share)	$ (0.54)	$ (0.16)	$ (0.04)	$ (0.25)	$ 1.01	$ 0.52	$ (0.08)	$ (0.15)