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Investments Investments (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule of Available-for-sale Securities          
Loans and Leases Receivable, Net Amount $ 0   $ 0   $ 20,000,000
Fair Value of Limited Partnership Interest     7,942,000    
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     $ 3,170,000