Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Fair Value, Liabilities Measured on Recurring Basis) (Details)

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Fair Value Measurements (Fair Value, Liabilities Measured on Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest Rate Derivative Assets, at Fair Value $ 3,481 $ 3,577  
Interest Rate Derivative Liabilities, at Fair Value     $ 1,160
Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest Rate Derivative Assets, at Fair Value 0 0  
Interest Rate Derivative Liabilities, at Fair Value     0
Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest Rate Derivative Assets, at Fair Value 3,481 3,577  
Interest Rate Derivative Liabilities, at Fair Value     1,160
Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest Rate Derivative Assets, at Fair Value $ 0 $ 0  
Interest Rate Derivative Liabilities, at Fair Value     $ 0