Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Derivative Financial Instruments - Gain (Loss) on Derivatives (Details) - Interest rate swaps - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Cash flow hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (Loss) recognized in OCI - effective portion $ (21,000) $ (550,000) $ 73,000 $ (629,000)  
Interest Expense and Other | Cash flow hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain recognized in income - effective portion (3,000) (86,000) 9,000 (86,000)  
Gain recognized in income - ineffective portion 10,000 $ 0 28,000 $ 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 $ 1,103,000   $ 1,103,000   $ 1,098,000