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Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]                    
AOCI before tax, beginning balance $ (6,106) $ (7,121) $ (7,979) $ (7,289) $ (5,539) $ (5,336) $ (7,979) $ (5,336)    
Accumulated other comprehensive income, tax, beginning balance (736) (741) (745) (949) (960) (970) (745) (970)    
Accumulated Other Comprehensive Income Beginning Balance (5,370) (6,380) (7,234) (6,340) (4,579) (4,366) (7,234) (4,366)    
Cumulative effect of new accounting principle in period of adoption                 $ 1,582 $ 274
Other comprehensive income (loss), net of tax (652)     166     1,212 (1,808)    
AOCI before tax, ending balance (6,754) (6,106) (7,121) (7,113) (7,289) (5,539) (6,754) (7,113)    
Accumulated other comprehensive income, tax, ending balance (732) (736) (741) (939) (949) (960) (732) (939)    
Accumulated Other Comprehensive Income Ending Balance (6,022) (5,370) (6,380) (6,174) (6,340) (4,579) (6,022) (6,174)    
Accumulated Translation Adjustment                    
AOCI Attributable to Parent, Net of Tax [Roll Forward]                    
AOCI before tax, beginning balance (4,099) (5,097) (5,939) (4,375) (2,588) (2,698) (5,939) (2,698)    
Other comprehensive income adjustments (664) 998 842 139 (1,787) 110        
Other comprehensive income (loss), net of tax (664) 998 842 139 (1,787) 110        
AOCI before tax, ending balance (4,763) (4,099) (5,097) (4,236) (4,375) (2,588) (4,763) (4,236)    
Accumulated Defined Benefit Plans Adjustment                    
AOCI Attributable to Parent, Net of Tax [Roll Forward]                    
Other comprehensive income adjustments 16 17 16 37 37 37        
Other comprehensive income (loss), tax 4 5 4 10 11 10        
Other comprehensive income (loss), net of tax 12 12 12 27 26 27        
Minimum pension and post retirement benefit plan adjustments | Accumulated Defined Benefit Plans Adjustment                    
AOCI Attributable to Parent, Net of Tax [Roll Forward]                    
AOCI before tax, beginning balance (2,007) (2,024) (2,040) (2,914) (2,951) (2,638) (2,040) (2,638)    
Other comprehensive income adjustments 16 17 16 37 37 37        
AOCI before tax, ending balance $ (1,991) $ (2,007) $ (2,024) $ (2,877) $ (2,914) $ (2,951) $ (1,991) $ (2,877)    
Accounting Standards Update 2018-02                    
AOCI Attributable to Parent, Net of Tax [Roll Forward]                    
Cumulative effect of new accounting principle in period of adoption                   (350)
Accounting Standards Update 2018-02 | Minimum pension and post retirement benefit plan adjustments                    
AOCI Attributable to Parent, Net of Tax [Roll Forward]                    
Cumulative effect of new accounting principle in period of adoption                   $ (350)