Investment in Affiliates, Net (Details) $ in Thousands, AUD in Millions	1 Months Ended				3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Nov. 30, 2016 USD ($)	Nov. 30, 2016 AUD	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jan. 31, 2016
Schedule of Investments [Line Items]
Investment in affiliates, net	$ 38,989				$ 38,989				$ 40,809				$ 38,989	$ 40,809
Equity in (losses)/earnings of affiliates, net of tax					46	$ (229)	$ (280)	$ (723)	(99)	$ 607	$ 78	$ (90)	(1,186)	496	$ 13,720
Income tax expense on earnings of investments in affiliates													(700)	1,000	9,100
Dividends received from investments in affiliates													1,198	9,044	30,084
Operating revenue					454,157	$ 483,131	$ 473,978	$ 439,851	$ 474,914	$ 523,896	$ 500,204	$ 453,543	1,851,117	1,952,557	1,528,110
Operating expenses													1,612,499	1,674,617	1,324,661
(Loss)/gain on investments and other, net													(2,316)	19,779	33,831
RELS LLC [Member]
Schedule of Investments [Line Items]
Gain on investments and other, net				$ 34,300
Amount paid to acquire business				$ 65,000
PIQ Acquisition [Member]
Schedule of Investments [Line Items]
Remaining equity interest acquired																40.00%
(Loss)/gain on investments and other, net		$ 7,300	AUD 9.9
Onthehouse Acquisition [Member]
Schedule of Investments [Line Items]
Amount paid to acquire business		$ 8,300	AUD 11.3
Joint Venture Loan Originations Products and Services [Member]
Schedule of Investments [Line Items]
Operating revenue															18,200
Revenue from Related Parties													10,300	10,300
Operating expenses															$ 13,000
Costs and Expenses, Related Party													11,800	$ 11,200
RELS LLC [Member]
Schedule of Investments [Line Items]
Remaining equity interest acquired				49.90%											49.90%
Ownership percentage in equity method investment				50.10%											50.10%
Percentage of income in equity earnings of affiliates, net of tax															84.90%
Noncontrolling interest, ownership percentage by parent									100.00%					100.00%
Location, Inc. [Member]
Schedule of Investments [Line Items]
Investment in affiliates, net	$ 6,500				$ 6,500								$ 6,500
Ownership percentage in equity method investment	38.21%				38.21%								38.21%
Speedy Title & Appraisal Review Services, LLC (STARS) [Member] | Discontinued Operations, Disposed of by Sale [Member]
Schedule of Investments [Line Items]
Proceeds from sale of equity method investment	$ 1,000
Onthehouse Acquisition [Member]
Schedule of Investments [Line Items]
Percentage of income in equity earnings of affiliates, net of tax		12.97%	12.97%