Supplemental Cash Flow Information and Non-cash Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Cash paid during the period for:
Interest	$ 160	$ 198
Income taxes	4,304	3,176
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	42,663	38,407	$ 33,065
Total cash, cash equivalents, and restricted cash shown in statements of cash flows	42,688	38,805	$ 33,118	$ 33,854
Prepaid expenses and other current assets
Cash and Cash Equivalents [Line Items]
Restricted cash and cash equivalents	0	398
Other long-term assets
Cash and Cash Equivalents [Line Items]
Restricted cash and cash equivalents	$ 25	$ 0