Income Taxes - Summary of Provision for (benefit of) Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Current:
Federal taxes									$ 1,159	$ (2,788)	$ 3,443
State taxes									(238)	(1,073)	1,556
Foreign taxes									744	678	498
Total current taxes									1,665	(3,183)	5,497
Deferred:
Federal taxes									3,752	2,949	824
State taxes									(428)	(2,510)	(879)
Foreign taxes									(195)	(86)	(74)
Total deferred taxes									3,129	353	(129)
Provision for (benefit of) income taxes	$ 2,000	$ 456	$ 1,896	$ 442	$ (8,964)	$ 1,487	$ 2,493	$ 2,154	$ 4,794	$ (2,830)	$ 5,368