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Consolidated Statements of Comprehensive Income - Parenthetical (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Net unrealized gain (loss) on derivative instruments arising during the period, tax $ 0 $ 0 $ 0 $ (3,116)
Reclassification adjustment for (gain) loss on derivative instruments included in net income, tax 50 (297) 264 (2,246)
Amortization of postretirement liability losses included in net periodic benefit cost, tax 159 166 477 1,027
Foreign currency translation adjustments arising during the period, tax (89) (12) (36) (209)
Reclassification adjustment for foreign currency translation (gain) loss included in net income, tax 0 70 0 70
Net unrealized gain (loss) on available-for-sale investments arising during the period, tax (33) (5) (48) (106)
Reclassification adjustment for loss (gain) on available-for-sale investments included in net income, tax $ 16 $ 20 $ 54 $ 63