Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Holiday [Line Items]
Income tax (benefit) expense	$ (5,705)	$ 10,822	$ (74,308)
Valuation Allowance, Deferred Tax Asset, Change in Amount	2,996	131	(112,886)
Deferred Tax Assets, Tax Credit Carryforwards	19,411	18,404
Unrecognized Tax Benefits	9,889	10,381	6,271
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	21,236	14,466
Undistributed Foreign Earnings	110,010
Cash and Cash Equivalents, at Carrying Value	116,653	116,305	192,464	103,579
Unrecognized Tax Benefits, Net	2,809	735
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	590	0
Internal Revenue Service (IRS) [Member]
Income Tax Holiday [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	136,191
Deferred Tax Assets, Tax Credit Carryforwards	24,213
Unrecognized Tax Benefits	3,463
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	3,669
Deferred Tax Assets, Tax Credit Carryforwards, Research	4,800	5,519	2,009
Foreign Country [Member]
Income Tax Holiday [Line Items]
Income Tax Holiday, Aggregate Dollar Amount	765	(1,309)
State and Local Jurisdiction [Member]
Income Tax Holiday [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	138,206
Deferred Tax Assets, Tax Credit Carryforwards	13,882
Unrecognized Tax Benefits	5,563
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	568
Domestic Country [Member]
Income Tax Holiday [Line Items]
Cash and Cash Equivalents, at Carrying Value	62,869
Foreign Country [Member]
Income Tax Holiday [Line Items]
Cash and Cash Equivalents, at Carrying Value	76,089
Stock Option Deductions [Member] | Internal Revenue Service (IRS) [Member]
Income Tax Holiday [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	64,308
Stock Option Deductions [Member] | State and Local Jurisdiction [Member]
Income Tax Holiday [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	11,498
Sale of capital assets [Domain]
Income Tax Holiday [Line Items]
Deferred Tax Assets, Capital Loss Carryforward Increase (Decrease)	(1,575)	(1,131)
Expiration of Capital Loss Carryforward [Domain]
Income Tax Holiday [Line Items]
Deferred Tax Assets, Capital Loss Carryforward Increase (Decrease)	$ (136)