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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Schedule of Available-for-sale Securities          
Loans and Leases Receivable, Net Amount $ 0   $ 0   $ 20,000
Fair Value of Limited Partnership Interest     8,029    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 0 $ 0 0 $ 0  
Other Long-term Investments          
Schedule of Available-for-sale Securities          
Payments to Acquire Other Investments     $ 2,708