Basis of Condensed Consolidated Financial Statements (Narrative) (Details) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended			6 Months Ended		12 Months Ended
	Apr. 30, 2020 $ / shares	Jan. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) business_day	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Jan. 01, 2020 USD ($)
Dividends received from investments in affiliates						$ 109	$ 0
Dividends payable (in usd per share) | $ / shares								$ 0.22
Dividends payable								$ (17,400)
Dividend equivalents			$ 17,464			17,464		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		6,300
Disposal group, liabilities current			400			400		400
Tax escrow deposits			832,000			832,000		1,400,000
Reserves incorrect disposition of assets			22,500			22,500		22,700
Restricted cash included in other assets			9,494		$ 11,662	9,494	11,662
Restricted cash included in prepaid expenses and other current assets			368		$ 2,024	$ 368	$ 2,024
Dividends declared (in usd per share) | $ / shares	$ 0.22
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
Accounts Payable and Accrued Liabilities
Reserves incorrect disposition of assets			$ 10,000			$ 10,000		$ 9,800
Location, Inc
Remaining equity interest acquired		66.00%
Consideration transferred		$ 11,500
Investment balance		$ 5,600
Dividends received from investments in affiliates				$ 700
Location, Inc | PIRM
Ownership percentage		34.00%
Step-up gain		$ 600
Ten Largest Clients | Sales Revenue, Net | Customer Concentration Risk
Concentration risk, percentage			34.00%		30.00%	32.00%	29.00%