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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative [Line Items]        
Total Interest Expense $ (24,234) $ (22,444) $ (45,265) $ (46,394)
Cash Flow Hedging | Interest rate contract        
Derivative [Line Items]        
Net interest expense on cash flows hedges (1,172) (1,348) (2,397) (2,735)
Realized net losses reclassified from other comprehensive income (14) (19) (28) (37)
Total Interest Expense $ (1,186) $ (1,367) $ (2,425) $ (2,772)