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Consolidated Statements of Comprehensive Income - Parenthetical (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net unrealized gain (loss) on derivative instruments arising during the period, tax $ 52 $ 15,059 $ (3,116) $ 13,129
Reclassification adjustment for (gain) loss on derivative instruments included in net income, tax (322) (1,077) (1,948) (2,738)
Net unrealized gain (loss) on available-for-sale investments arising during the period, tax (77) (23) (100) (26)
Reclassification adjustment for (gain) loss on available-for-sale investments included in net income, tax 23 20 42 37
Amortization of postretirement liability losses included in net periodic benefit cost, tax 543 0 862 0
Foreign currency translation adjustment, tax $ (234) $ (402) $ (197) $ (265)