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Derivative Financial Instruments Effectiveness Testing (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Interest rate swap agreements [Member]        
Gain/(loss) reclassified from accumulated other comprehensive income/(loss) into earnings due to ineffectiveness $ 0 $ 0 $ 0 $ 0
Existing net gains/losses realized and recorded as interest income/expense 400,000 900,000 1,100,000 2,500,000
Existing net gains/losses expected to be realized within the next 12 months     4,100,000  
Foreign Exchange Forward [Member]        
Gain/(loss) reclassified from accumulated other comprehensive income/(loss) into earnings due to ineffectiveness $ 0 $ 0 0 $ 0
Existing net gains/losses expected to be realized within the next 12 months     $ 600,000