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Derivative Financial Instruments Effectiveness Testing (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Interest rate swap [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net   $ 0 $ 0 $ 0
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion   2,900,000 $ 2,400,000 $ 4,100,000
Foreign Exchange Forward [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net   $ 0    
Scenario, Forecast [Member] | Interest rate swap [Member]        
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Realized in the next 12 Months $ (800,000)