Income Taxes (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended
	Aug. 31, 2007 Rate	Dec. 31, 2012 Rate	Dec. 31, 2011 Rate	Dec. 31, 2010 Rate
Income Taxes [Line Items]
Federal statutory rate		35.00%	35.00%	35.00%
Repatriated of previously taxed income			$ 86,400,000
Realization of foreign currency gain			17,700,000
Tax expenses due to remeasurement of state deferred tax assets and liabilities using future tax rate				7,800,000
State income tax benefit		7,960,000	1,963,000	(27,777,000)
Total deferred tax assets		138,052,000	151,701,000
Net operating loss carryforwards		4,700,000
Operating Loss Carryforwards, Valuation Allowance		4,700,000
Alternative minimum tax credits		10,400,000
Tax-affected amount recorded in equity		81,700,000
Regular statutory tax rate in India		33.00%
Undistributed earnings of foreign subsidiaries		693,100,000
Tax holiday rate		25.50%	12.70%
Impact of tax holiday on diluted earnings per share		$ 0.11	$ 0.06	$ 0.12
Unrecognized tax benefits, including penalties and interest, that would affect the Company's effective tax rate if realized		46,400,000
Debt Instruments, Discount Rate	8.50%	8.50%
Debt Instrument, Interest Rate, Stated Percentage		3.25%
Tax Credit Carryforward, Expiration Date		2013 through 2030
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards		20,400,000
Federal research tax credits		37,300,000
Operating Loss Carryforwards, Expiration Dates		2015 through 2017
State [Member]
Income Taxes [Line Items]
Net operating loss carryforwards		895,000,000
Federal research tax credits		1,300,000
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryforwards		$ 111,400,000
Federal And State [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards, Expiration Dates		2013 through 2030