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Fair Value Measurements (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest Rate Derivative Assets, at Fair Value   $ 31,000
Assets:    
Total $ 4,463,000 4,397,000
Liabilities:    
Interest rate derivative financial instruments 45,566,000 31,153,000
Total 45,566,000 31,153,000
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest Rate Derivative Assets, at Fair Value   0
Assets:    
Total 0 0
Liabilities:    
Interest rate derivative financial instruments 0 0
Total 0 0
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest Rate Derivative Assets, at Fair Value   31,000
Assets:    
Total 4,463,000 4,397,000
Liabilities:    
Interest rate derivative financial instruments 45,566,000 31,153,000
Total 45,566,000 31,153,000
Investments [Member]    
Assets:    
Investments, Fair Value Disclosure 4,332,000 4,235,000
Investments [Member] | Level 1 [Member]    
Assets:    
Investments, Fair Value Disclosure 0 0
Investments [Member] | Level 2 [Member]    
Assets:    
Investments, Fair Value Disclosure 4,332,000 4,235,000
Demand Obligation [Member]    
Assets:    
Investments, Fair Value Disclosure 131,000 131,000
Demand Obligation [Member] | Level 1 [Member]    
Assets:    
Investments, Fair Value Disclosure 0 0
Demand Obligation [Member] | Level 2 [Member]    
Assets:    
Investments, Fair Value Disclosure $ 131,000 $ 131,000