Revenue from Contract with Customer (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue	$ 469,624	$ 366,620	$ 291,609
Contract acquisition costs non-current, ending balance	40,675	$ 41,021
Remaining performance obligations	$ 362,800
Revenue, Remaining Performance Obligation, Percentage	94.00%
Deferred Revenue, Period Increase (Decrease)	$ 9,600
Recognition of deferred revenue	$ 75,500
Minimum
Amortization period for contract acquisition costs (in years)	3 years
Maximum
Amortization period for contract acquisition costs (in years)	5 years