Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Oct. 08, 2019	Oct. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill			$ 42,332	$ 43,832	$ 43,620
Net cash conveyed at closing			$ 18,692	$ 249	$ 44,750
Cleansorb Limited [Member]
Business Acquisition [Line Items]
Receivables	$ 2,691
Intangible assets	8,268
Other assets	974
Total assets acquired	11,933
Deferred tax liabilities	1,197
Other liabilities	1,302
Total liabilities assumed	2,499
Net assets purchased	9,434
Goodwill	9,258
Net cash conveyed at closing	$ 18,692	$ 18,700