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Other Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]    
Balance, beginning balance $ 167,498 $ 161,554
Balance, ending period 171,545 163,516
Accumulated Defined Benefit Plans Adjustment Attributable to Parent    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]    
Balance, beginning balance (156) (125)
Amortization of unrecognized transition obligation 0 0
Change in unamortized net actuarial gain (loss) 0 0
Related deferred taxes 0 0
Balance, ending period $ (156) $ (125)