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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative [Line Items]        
Total Interest Expense $ (21,597) $ (23,875) $ (67,991) $ (70,844)
Cash Flow Hedging | Interest rate contract        
Derivative [Line Items]        
Net interest expense on cash flows hedges (1,314) (1,466) (4,049) (4,425)
Realized net losses reclassified from other comprehensive income (18) (19) (55) (77)
Total Interest Expense $ (1,332) $ (1,485) $ (4,104) $ (4,502)