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Income Taxes (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes      
Income tax provision (benefit) at U.S. statutory rates $ 95,231,000 $ 103,838,000 $ (4,053,000)
State income tax expense (benefit) (net of federal impact) 1,616,000 6,379,000 188,000
Nondeductible expenses (749,000) 333,000 145,000
Noncontrolling interest     28,000
Equity compensation     1,678,000
Domestic production activities deduction (4,581,000) (6,365,000)  
Nondeductible compensation 841,000 2,840,000 826,000
Research and development tax credit (4,675,000) (1,823,000) (1,855,000)
Net change in valuation allowance 121,000 (83,079,000) 5,110,000
Change in accrual for unrecognized tax benefits 824,000 (1,076,000) (4,114,000)
Foreign tax rate differential (5,225,000) (5,280,000) 5,450,000
Other (1,819,000) 3,738,000 (845,000)
Income tax provision 81,584,000 19,505,000 2,558,000
Income tax expense (benefit) relating to discontinued operations (29,400,000) 45,200,000  
Current tax benefit related to share-based compensation $ 10,400,000 $ 23,300,000