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Derivative Financial Instruments - Impact on Interest Expense of Interest Rate Agreements Accounted for as Cash Flow Hedges (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative [Line Items]    
Total Interest Expense $ (21,031) $ (23,950)
Cash Flow Hedging | Interest rate contract    
Derivative [Line Items]    
Net interest expense on cash flows hedges (1,225) (1,387)
Realized net losses reclassified from other comprehensive income (14) (18)
Total Interest Expense $ (1,239) $ (1,405)