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Bank Debt (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Bank Debt [Abstract]        
Payments required by interest rate swaps $ 2,824 $ 10,044 $ 8,109 $ 21,720
Other comprehensive income (loss), net of taxes $ 16,241 $ (8,476) $ 60,100 $ 1,594