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Commitments and Contingencies - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Nov. 10, 2015
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]        
Approved insurers, required assets (equal or greater than)   $ 400,000,000    
Approved insurers, risked-based required assets, primary insurance floor   5.60%    
Rent expense $ 1,500,000 $ 1,500,000 $ 1,600,000  
Senior Secured Term Loan B [Member] | Credit Agreement [Member]        
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]        
Debt instrument, face amount       $ 150,000,000