Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments - Gain (Loss) on Derivatives (Details)

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Derivative Financial Instruments - Gain (Loss) on Derivatives (Details) - Interest rate swaps - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Cash flow hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
(Loss) gain on interest rate swaps, net $ 108,000 $ (21,000) $ 367,000 $ 73,000  
Interest Expense and Other | Cash flow hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) recognized in income - effective portion 145,000 (3,000) 244,000 9,000  
Gain recognized in income - ineffective portion (15,000) $ 10,000 (31,000) $ 28,000  
Other long-term liabilities | Level 2 | Derivative Financial Instruments | Recurring          
Derivative Instruments, Gain (Loss) [Line Items]          
Notional amount 75,000,000   75,000,000   $ 75,000,000
Derivative liability $ 1,465,000   $ 1,465,000   $ 1,329,000