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Other Comprehensive Income (Loss), Summary of Unrealized Gains and Losses on Postretirement Benefits - (Details) - Accumulated Defined Benefit Plans Adjustment - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance at beginning of year $ (125) $ 188 $ (123)
Amortization of unrecognized transition obligation 0 0 5
Change in unamortized net actuarial gain (loss) (48) (481) 475
Related deferred taxes 17 168 (169)
Balance at end of year $ (156) $ (125) $ 188