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Income Taxes, Components of Deferred Income Tax (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Components Of Deferred Tax Assets And Liabilities Abstract    
Net current deferred income tax asset $ 31,905 $ 26,757
Noncurrent deferred income tax assets    
Net operating loss ("NOL") carryforwards 48,565 33,724
Stock-based compensation 19,079 17,204
Other 36,195 38,998
Gross noncurrent deferred income tax assets 103,839 89,926
Less valuation allowance (29,262) (28,252)
Total noncurrent deferred income tax assets 74,577 61,674
Noncurrent deferred income tax liabilities    
Licenses/intangibles 267,344 246,599
Property, plant and equipment 482,433 323,334
Partnership investments 120,941 71,566
Other 3,049 3,619
Total noncurrent deferred income tax liabilities 873,767 645,118
Net noncurrent deferred income tax liability $ 799,190 $ 583,444