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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss $ 160,307 $ 153,966 $ 123,844 $ 120,061
Unrealized Losses on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss (2,748) (957) (13)  
Pension Liability        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss (5,935) (6,135) (5,539)  
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss $ (8,683) $ (7,092) $ (5,552) $ (6,024)