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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Consolidated Statements of Comprehensive Income [Abstract]    
Net income (loss) $ 56,139 $ 56,515
Net unrealized gain (loss) on derivative instruments qualifying as hedges:    
Net unrealized loss on derivative instruments arising during the period, net of tax of $0 and $(3,168) for the three months ended in 2014 and 2013, respectively 0 (5,849)
Reclassification adjustment for (gain) loss on derivative instruments included in net income, net of tax of $204 and $(1,626) for the three months ended in 2014 and 2013, respectively 344 (2,772)
Net unrealized gain (loss) on derivative instruments qualifying as hedges 344 (8,621)
Amortization of postretirement liability losses included in net periodic benefit cost, net of tax of $168 and $319 for the three months ended in 2014 and 2013, respectively 275 648
Foreign currency translation adjustment recognized during the period, net of tax of $28 and $37 for the three months ended in 2014 and 2013, respectively 46 88
Net unrealized gain (loss) on available-for-sale investments:    
Net unrealized loss on available-for-sale investments arising during the period, net of tax of $(19) and $(24) for the three months ended in 2014 and 2013, respectively (36) (44)
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax of $20 and $19 for the three months ended in 2014 and 2013, respectively 38 35
Net unrealized gain (loss) on available-for-sale investments 2 (9)
Other comprehensive income (loss) 667 (7,894)
Comprehensive income 56,806 48,621
Comprehensive loss attributable to noncontrolling interest (523) 0
Comprehensive income attributable to common stockholders $ 57,329 $ 48,621