Revision of Previously Issued Financial Statements (Consolidated Statement of Cash Flows) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net income	$ 24,684	$ 14,500
Deferred income taxes	51	105
Accounts receivable	30,746	(19,957)
Accrued expenses and other long-term liabilities	7,570	(3,404)
Net cash provided by operating activities	$ 73,299	8,084
As Previously Reported [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net income		15,247
Deferred income taxes		372
Accounts receivable		(22,291)
Accrued expenses and other long-term liabilities		(2,084)
Net cash provided by operating activities		8,084
Revision [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net income		(747)
Deferred income taxes		(267)
Accounts receivable		2,334
Accrued expenses and other long-term liabilities		$ (1,320)