Debt - Debt Extinguishment - Narrative (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Debt Instrument [Line Items]    
Net gain (loss) on debt extinguishment $ (1,230,000) $ 0
Mortgages    
Debt Instrument [Line Items]    
Amount of debt defeasance 162,800,000  
Weighted average contractual interest rate 5.76%  
Net gain (loss) on debt extinguishment $ (1,200,000)