Commitments and Contingencies - Contingencies (Details) $ in Thousands			1 Months Ended	12 Months Ended
	Sep. 12, 2016 USD ($)	Oct. 07, 2013 USD ($)	Apr. 30, 2010 item	Dec. 31, 2018 USD ($) lease	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items]
Rent expense, excluding amounts related to gain or loss on sublease				$ 7,700	$ 7,800	$ 7,500
Operating sublease income				$ 1,300	1,000	$ 1,100
Loss recorded related to subleased office space							$ 1,200
Gain recognized on amendment of sublease agreement					300
Number of leases assigned to purchasers | lease				21
Self insurance program liability				$ 300	400
Assignment and Assumption of Lease Agreements
Loss Contingencies [Line Items]
Outstanding lease guarantees				2,000
Master Lease
Loss Contingencies [Line Items]
Number of renewal periods | item			2
Renewal of lease period			10 years
Annual rent escalation in initial lease period and in first renewal period			3.00%
Gain (Loss) on Sublease					(3,600)
Master Lease | May 2017
Loss Contingencies [Line Items]
Gain (Loss) on Sublease					(200)
Master Lease | August 2017
Loss Contingencies [Line Items]
Gain (Loss) on Sublease					(3,700)
Master Lease | September 2017
Loss Contingencies [Line Items]
Gain (Loss) on Sublease					300
Tails Inc.
Loss Contingencies [Line Items]
Cash consideration		$ 20,200
Full House Mortgage Connection, Inc.
Loss Contingencies [Line Items]
Cash consideration	$ 8,000
Accrued liabilities | Full House Mortgage Connection, Inc.
Loss Contingencies [Line Items]
Short-term portion of liability				5,100
Other liabilities
Loss Contingencies [Line Items]
Long-term portion of liability				$ 2,400	$ 3,900