Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Hierarchy) (Details)

v3.8.0.1
Fair Value Measurements (Hierarchy) (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps (prepaids and other assets) $ 8,116,000 $ 5,533,000
Total assets 8,116,000 5,533,000
Interest rate swaps (other liabilities) 32,000 188,000
Total liabilities 32,000 188,000
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
Interest rate swaps (other liabilities) 0 0
Total liabilities 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) 8,116,000 5,533,000
Total assets 8,116,000 5,533,000
Interest rate swaps (other liabilities) 32,000 188,000
Total liabilities 32,000 188,000
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
Interest rate swaps (other liabilities) 0 0
Total liabilities $ 0 $ 0