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Income Taxes, Components of Deferred Income Tax (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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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

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