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Comprehensive Income (Loss)-Additional Information (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Comprehensive Income (Loss) Disclosure [Abstract]    
Other comprehensive income / (loss) for the period $ 2,254 $ 18,900
Comprehensive income (loss) 72,867 66,113
Interest rate swaps (15,574) (8,862)
Reclassification to Net Income $ 17,777 21,596
Net settlements on interest rate swaps qualifying for cash flow hedge   (489)
Amounts reclassified from Net settlements on interest rate swaps qualifying for hedge accounting to Depreciation $ (51) (51)
Amounts reclassified from Net settlements on interest rate swaps qualifying for hedge accounting to Prepaid lease rentals   $ (6,604)