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Summary of Significant Accounting Policies (Narrative) (Details)
shares in Millions
 1 Months Ended 12 Months Ended
Jan. 31, 2016
USD ($)
Aug. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Business Combination, Consideration Transferred   $ 82,400,000      
Unfunded settlements     $ 27,500,000 $ 5,100,000  
Intangible asset useful life     20 years    
Intangible assets, acquired cost (gross)     $ 259,000,000 259,000,000  
Intangible assets, accumulated amortization     148,800,000 135,900,000  
Intangible assets amortization expense     12,900,000 13,033,000 $ 13,100,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months     12,900,000    
Future Amortization Expense, Year Two     12,900,000    
Future Amortization Expense, Year Three     12,900,000    
Future Amortization Expense, Year Four     12,900,000    
Future Amortization Expense, Year Five     12,900,000    
Intangible asset impairment expense     0 0 0
Property and equipment, net     86,312,000 75,219,000  
Property and equipment, accumulated depreciation     185,800,000 192,200,000  
Depreciation Expense     33,300,000 26,800,000 18,500,000
Advertising Expense     45,300,000 41,800,000 42,400,000
Employee benefit plan company contributions     12,600,000 $ 12,100,000 11,000,000
Charges related to contractual dispute     $ 20,000,000   $ 41,200,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares     3.9 6.6 9.6
Number of VIEs requiring consolidation     0 0  
Residential mortgage loans available-for-sale     $ 442,715,000 $ 339,531,000  
Residential mortgage loans available-for-sale aggregate outstanding principal balance     429,600,000 327,400,000  
Net gain (loss) from change in fair value     (300,000) 1,700,000  
Net gains from the sale of mortgages     80,800,000 67,200,000 $ 80,300,000
Loans held for investment, net     $ 7,600,000 12,500,000  
Days past contractual term once loans no longer accrue interest income     90 days    
Variability in future cash flows of derivative instruments in days     75 days    
Furniture and Fixtures [Member]          
Property and equipment, useful life     2 years    
Minimum [Member]          
Period of Reimbursement of Payments on Loan Prepay in Days     90 days    
Minimum [Member] | Equipment [Member]          
Property and equipment, useful life     3 years    
Maximum [Member]          
Period of Reimbursement of Payments on Loan Prepay in Days     120 days    
Maximum [Member] | Equipment [Member]          
Property and equipment, useful life     10 years    
Financial Services [Member]          
Interest income on mortgage loans     $ 6,900,000 7,200,000 $ 7,500,000
Interest Rate Lock Commitments [Member]          
Derivative, notional amount     208,200,000 146,100,000  
Forward Contracts [Member]          
Derivative, notional amount     525,000,000 371,000,000  
Whole Loan Commitments [Member]          
Derivative, notional amount     $ 77,600,000 $ 63,500,000  
Subsequent Event [Member]          
Business Combination, Consideration Transferred $ 430,000,000