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Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Estimated fair value of consolidated debt $ 4,100,000 $ 4,000,000
Total indebtedness 3,917,590 3,849,141
Cash Flow Hedging [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notional amount of interest rate swaps $ 49,800 49,900
Average Remaining Maturity of Interest Rate Swaps 4 years 9 months  
Period For Reclassification Into Earnings 12 months  
Amount of unrealized gains (losses) estimated to be reclassified from accumulated other comprehensive loss to earnings during the next 12 months $ 1,500  
Weighted average fixed rate of interest rate swaps 3.43%  
Available-for-sale Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Face amount of investment in available-for-sale debt securities $ 100,900  
Excepted Remaining Term of Available For Sale Securities 5 years 2 months  
Amortized cost of the investment in available-for-sale debt securities $ 69,000 67,800
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage-backed securities Available-for-sale, fair value disclosure $ 72,817 $ 65,502