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Consolidated Statements of Comprehensive Income - Parenthetical (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net unrealized gain (loss) on derivative instruments arising during the period, tax $ 0 $ (5,377) $ (3,116) $ 4,570
Reclassification adjustment for (gain) loss on derivative instruments included in net income, tax (297) (4,570) (2,246) (4,126)
Net unrealized gain (loss) on available-for-sale investments arising during the period, tax (5) 4 (106) (22)
Reclassification adjustment for (gain) loss on available-for-sale investments included in net income, tax 20 17 63 54
Amortization of postretirement liability losses included in net periodic benefit cost, tax 166 0 1,027 0
Foreign currency translation adjustments arising during the period, tax (12) (10) (209) (275)
Reclassification adjustment for foreign currency translation (gain) loss included in net income, tax $ 70 $ 2 $ 70 $ 2