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Fair Value of Financial Instruments Fair Value, Assets Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring
$ in Thousands
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash America nonqualified saving plan-related assets $ 12,663
Total assets 12,663
Fair Value Level 1  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash America nonqualified saving plan-related assets 12,663
Total assets 12,663
Fair Value Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash America nonqualified saving plan-related assets 0
Total assets 0
Fair Value Level 3  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash America nonqualified saving plan-related assets 0
Total assets $ 0