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Income Taxes (Significant Components Of Deferred Income Tax Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Investments, Owned, Federal Income Tax Note [Line Items]    
Allowance for uncollectible accounts $ 47,459 $ 34,254
Net operating loss carryforward 3,533 7,799
Reserves and accruals 40,807 37,045
Other 483 488
Stock-based compensation 18,657 18,316
Total deferred tax assets 110,939 97,902
Accrual to cash adjustment (28,575) (24,040)
Property and equipment (128) (965)
Amortization (105,753) (86,384)
Total deferred tax liabilities (134,456) (111,389)
Net deferred tax (liability) asset (23,517) (13,487)
Current [Member]
    
Investments, Owned, Federal Income Tax Note [Line Items]    
Allowance for uncollectible accounts 47,459 34,254
Net operating loss carryforward 3,533 7,799
Reserves and accruals 36,828 33,378
Other 483 488
Stock-based compensation 10,586 8,700
Total deferred tax assets 98,889 84,619
Accrual to cash adjustment (28,575) (24,040)
Total deferred tax liabilities (28,575) (24,040)
Net deferred tax (liability) asset 70,314 60,579
Non-Current [Member]
    
Investments, Owned, Federal Income Tax Note [Line Items]    
Reserves and accruals 3,979 3,667
Stock-based compensation 8,071 9,616
Total deferred tax assets 12,050 13,283
Property and equipment (128) (965)
Amortization (105,753) (86,384)
Total deferred tax liabilities (105,881) (87,349)
Net deferred tax (liability) asset $ (93,831) $ (74,066)