Derivative and Hedging Activities - Narrative (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Dec. 31, 2013
debt_obligation
Dec. 31, 2014
Dec. 31, 2012
Derivative [Line Items]      
Number of variable rate debt obligations repaid during period 4    
Termination fees $ 0.4    
Derivative instruments loss estimated to be reclassified from accumulated OCI as an increase to interest expense   1.1  
General and Administrative Expense [Member]      
Derivative [Line Items]      
Gain on derivative termination 0.1    
Loss on cash flow hedge ineffectiveness     $ 4.0
Derivative Instrument 4 [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Accounts Payable, Accrued Expenses and Other Liabilities [Member]      
Derivative [Line Items]      
Fixed weighted average interest rate of the Company's variable rate debt   4.55%