Derivative Instruments and Hedging Activities - Accumulated Comprehensive Income (Loss) Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Gain/(Loss) (Pre-tax)	$ (1,189)	$ 0
Amount Reclassified from Other Comprehensive Loss into Interest Expense (Pre-tax)	4,496	1,014
Ending Balance Gain/(Loss) (Pre-tax)	(5,700)	(1,189)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Amount Recognized in Other Comprehensive Loss on Derivative (Pre-tax)	(9,007)	(2,203)
Ending Balance Gain/(Loss) (Pre-tax)	$ (5,700)