Basis of Condensed Consolidated Financial Statements (Narrative) (Details) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended
	Jan. 16, 2020 USD ($)	Apr. 30, 2020 $ / shares	Mar. 31, 2020 USD ($) business_day	Dec. 31, 2019 USD ($) $ / shares	Mar. 31, 2019 USD ($)	Jan. 15, 2020 USD ($)	Jan. 01, 2020 USD ($)
Equity in earnings/(losses) of affiliates, net of tax			$ 512		$ (422)
Revenue from related parties			0
Operating expenses with related parties			100		200
Dividends received from investments in affiliates			185		0
Dividends payable (in usd per share) | $ / shares				$ 0.22
Dividends payable				$ (17,400)
Dividend equivalents			0	400
Tax ASU - Effect of change on retained earnings							$ 16,800
Disposal Group - Deferred income tax assets and other current assets			6,300	6,300
Disposal group, liabilities current			400	400
Tax escrow deposits			6,800,000	1,400,000
Reserves incorrect disposition of assets			22,400	22,700
Restricted cash included in other assets			9,714		11,134
Restricted cash included in prepaid expenses and other current assets			178		$ 1,985
Accounts Payable and Accrued Liabilities
Reserves incorrect disposition of assets			9,800	$ 9,800
Location, Inc
Remaining equity interest acquired	66.00%
Consideration transferred			11,500
Ownership percentage						34.00%
Investment balance						$ 5,600
Step-up gain	$ 600
Dividends received from investments in affiliates			$ 700
Ten Largest Clients | Sales Revenue, Net | Customer Concentration Risk
Concentration risk, percentage			31.00%		29.00%
Minimum
Period that escrow deposits are held (in business days) | business_day			2
Maximum
Period that escrow deposits are held (in business days) | business_day			5
Subsequent Event
Dividends declared (in usd per share) | $ / shares		$ 0.22