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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Cash flow hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) recognized in OCI - effective portion $ 29,000 $ 456,000 $ 102,000 $ (86,000)  
Interest Expense and Other | Cash flow hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) recognized in income - effective portion 39,000 76,000 30,000 163,000  
Gain recognized in income - ineffective portion (13,000) $ 0 (41,000) $ 0  
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 $ 1,073,000   $ 1,073,000   $ 1,098,000