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Derivatives - Effect On Condensed Consolidated Statements of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivatives Designated as Hedging Instruments | Interest rate swap contract | Cash Flow Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Income recognized in other comprehensive income before reclassifications $ 28 $ 8 $ 242 $ 6
Derivatives Designated as Hedging Instruments | Interest rate swap contract | Cash Flow Hedging | Interest expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Income (loss) reclassified from accumulated other comprehensive income to earnings for the effective portion 65 (26) 140 (189)
Derivatives Designated as Hedging Instruments | Interest rate swap contract | Cash Flow Hedging | Income tax expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Income tax benefit (expense) (19) 11 (36) 65
Not Designated as Hedging Instruments | Income tax expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Income tax benefit (expense) 176 18 200 18
Not Designated as Hedging Instruments | Other, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Loss recognized in earnings $ (601) $ (53) $ (789) $ (53)