Income Taxes (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes
Income tax provision at U.S. statutory rates	$ 13,366,000	$ 95,231,000	$ 103,838,000
State income tax (benefit) expense (net of federal impact)	(89,000)	1,616,000	6,379,000
Nondeductible expenses	622,000	(749,000)	333,000
Domestic production activities deduction	(489,000)	(4,581,000)	(6,365,000)
Nondeductible compensation	205,000	841,000	2,840,000
Research and development tax credit	(3,013,000)	(4,675,000)	(1,823,000)
Net change in valuation allowance	2,943,000	121,000	(83,079,000)
Change in accrual for unrecognized tax benefits	533,000	824,000	(1,076,000)
Foreign tax rate differential	(2,387,000)	(5,225,000)	(5,280,000)
Other	(34,000)	(1,819,000)	3,738,000
Total provision for income taxes	11,657,000	81,584,000	19,505,000
Additional tax of foreign jurisdiction	4,000,000
Long term taxes payable	4,000,000
Income tax expense (benefit) relating to discontinued operations	1,900,000	(29,400,000)
Current tax benefit related to share-based compensation	$ 2,100,000	$ 10,400,000