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Income Taxes (Non-Current Deferred Tax Liabilities And Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Abstract]    
Fixed assets $ 11,400 $ 9,263
Net unrealized holding gain of available-for-sale securities 4 4
Prepaid insurance and pension 3,123 28
Intangible assets 176,459 146,815
Total non-current deferred tax liabilities 190,986 156,110
Deferred compensation 11,341 8,232
Accruals and reserves      
Net operating loss carryforwards 2,071 1,721
Valuation allowance for deferred tax assets (478) (325)
Total non-current deferred tax assets 12,934 9,628
Net non-current deferred tax liability $ 178,052 $ 146,482