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Commitments and Contingencies - Contingencies (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
lease
agreement
Assignment and Assumption of Lease Agreements  
Loss Contingencies [Line Items]  
Number of leases assigned to purchasers | lease 21
Number of assignment agreements | agreement 3
Outstanding lease guarantees $ 3.2
Full House Mortgage Connection, Inc.  
Loss Contingencies [Line Items]  
Contingent consideration liability $ 6.7