Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Hierarchy) (Details)

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Fair Value Measurements (Hierarchy) (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps (prepaids and other assets) $ 4,211,000 $ 3,993,000
Total assets 4,211,000 3,993,000
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps (prepaids and other assets) 0 0
Total assets 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps (prepaids and other assets) 4,211,000 3,993,000
Total assets 4,211,000 3,993,000
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps (prepaids and other assets) 0 0
Total assets $ 0 $ 0