Income Taxes (Income Before Income Taxes and Provision for Income Taxes) (Details) - USD ($) $ 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
Income (loss) before income taxes
Domestic													$ 24,835	$ 30,835	$ 34,136
Foreign													(658)	(350)	2,940
Total													24,177	30,485	37,076
Current income tax provision (benefit):
Federal													2,966	(323)	12,647
State													1,106	356	1,396
Foreign													3,525	1,919	1,449
Total current													7,597	1,952	15,492
Deferred income tax provision (benefit):
Federal													856	5,592	3,417
State													1,676	447	(96)
Foreign													(1,045)	(565)	154
Total deferred													1,487	5,474	3,475
Income tax provision	$ 5,699	$ 2,449	$ 630	$ 307	$ 3,420	$ 2,280	$ 811	$ 916	$ 937	$ 1,727	$ 3,385	$ 4,007	$ 9,084	$ 7,426	$ 18,967