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Significant Accounting Policies (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
payment
segment
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Accounting Policies [Abstract]          
Number of operating segments | segment     3    
Number of reportable segments | segment     1    
Delinquent consumer loans (days)     60 days    
Delinquent installment loans (payments) | payment     2    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Increase non-current deferred tax assets $ 9,912 $ 8,322 $ 9,912 $ 8,322 $ 9,321
Increase in non-current deferred tax liabilities 42,125 20,033 42,125 20,033 21,464
Reduction in comprehensive income (15,413) (10,363) (7,269) 6,108  
Deferred finance costs, net 3,627 4,288 3,627 4,288 4,126
Scenario, Adjustment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Increase non-current deferred tax assets   26,428   26,428  
Reduction in comprehensive income   (7,538)   (12,318)  
Accounting Standards Update 2015-17 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Decrease in current deferred tax assets   6,632   6,632  
Increase non-current deferred tax assets   26,665   26,665  
Increase in non-current deferred tax liabilities   20,033   20,033  
Accounting Standards Update 2015-03 [Member] | Other Noncurrent Assets [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred finance costs, net (3,627) (4,288) (3,627) (4,288) (4,126)
Accounting Standards Update 2015-03 [Member] | Senior Unsecured Notes [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred finance costs, net $ 3,627 $ 4,288 $ 3,627 $ 4,288 $ 4,126