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Other Assets - Retained Interest Investments (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Investments    
Retained interest investments $ 11,935 $ 11,536
Retained interest investments    
Investments    
Expected amount to receive upon maturity of note after payment of note and any other liabilities $ 16,700  
Promissory notes maturity period 15 years  
Retained interest investments $ 11,900 $ 11,500
Minimum | Retained interest investments    
Investments    
Notes maturity year 2022  
Maximum | Retained interest investments    
Investments    
Notes maturity year 2024