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Income Taxes, Components of Deferred Income Tax (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Components Of Deferred Tax Assets And Liabilities Abstract    
Net deferred income tax asset $ 35,419 $ 31,905
Noncurrent deferred income tax assets    
Net operating loss ("NOL") carryforwards 63,240 48,565
Stock-based compensation 22,411 19,079
Compensation and benefits, other 13,673 2,985
Deferred rent 15,822 12,656
Other 25,432 20,554
Gross noncurrent deferred income tax assets 140,578 103,839
Deferred tax assets valuation allowance noncurrent (40,208) (29,262)
Total noncurrent deferred tax assets 100,370 74,577
Noncurrent deferred income tax liabilities    
Licenses/intangibles 294,738 267,344
Property, plant and equipment 527,547 482,433
Partnership investments 124,221 120,941
Other 3,682 3,049
Total noncurrent deferred tax liabilities 950,188 873,767
Net noncurrent deferred income tax liability $ 849,818 $ 799,190