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Other Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance     $ 172,521 $ 167,498
Ending balance $ 179,882 $ 175,994 179,882 175,994
Accumulated Defined Benefit Plans Adjustment Attributable to Parent        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance (102) (156) (102) (156)
Amortization of unrecognized transition obligation 0 0 0 0
Change in unamortized net actuarial gain (loss) 0 0 0 0
Related deferred taxes 0 0 0 0
Ending balance $ (102) $ (156) $ (102) $ (156)