Commitments and Contingencies - Contingencies (Details) $ in Thousands				1 Months Ended	12 Months Ended
	Feb. 28, 2018 USD ($)	Sep. 12, 2016 USD ($)	Oct. 07, 2013 USD ($)	Apr. 30, 2010 item	Dec. 31, 2017 USD ($) lease	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items]
Rent expense, excluding amounts related to gain or loss on sublease					$ 7,800	$ 7,500	$ 10,600
Operating sublease income					1,000	1,100	$ 1,200
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					$ 400	300
Payment of legal settlement	$ 4,500
Assignment and Assumption of Lease Agreements
Loss Contingencies [Line Items]
Outstanding lease guarantees					3,700
Master Lease
Loss Contingencies [Line Items]
Lease initial term				18 years
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					(3,604)
Master Lease | May 2017
Loss Contingencies [Line Items]
Gain (Loss) on Sublease					(173)
Master Lease | August 2017
Loss Contingencies [Line Items]
Gain (Loss) on Sublease					(3,725)
Master Lease | September 2017
Loss Contingencies [Line Items]
Gain (Loss) on Sublease					294
Second Optional Renewal Period
Loss Contingencies [Line Items]
Percentage of increase in rent each year				3.00%
Tails Inc.
Loss Contingencies [Line Items]
Cash consideration			$ 20,200
Full House Mortgage Connection, Inc.
Loss Contingencies [Line Items]
Contingent consideration liability		$ 6,300
Cash consideration		$ 8,000
Accrued liabilities | Full House Mortgage Connection, Inc.
Loss Contingencies [Line Items]
Short-term portion of liability					300
Other liabilities
Loss Contingencies [Line Items]
Long-term portion of liability					3,900	$ 800
Other liabilities | Full House Mortgage Connection, Inc.
Loss Contingencies [Line Items]
Long-term portion of liability					$ 6,300