Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Income tax benefit from release of valuation allowance	$ 10,651,000	$ 0	$ 0
Deferred Tax Assets, Valuation Allowance	5,396,000	19,537,000
Operating loss carryforwards, federal	37,855,000
Federal NOL Annual Utilization Limit	14,100,000
Operating loss carryforwards, state	55,559,000
Net operating losses, unrecognized excess tax benefits, federal	1,928,000
Net operating losses, unrecognized excess tax benefits, state	33,166,000
Tax benefit from stock options exercised, federal	0
Tax fenefit from stock options exercised, state	554,000
Foreign withholding taxes		7,586,000
Excess tax benefits from stock-based compensation	13,210,000	583,000	1,302,000
Foreign tax credits, additional paid in capital benefit	20,313,000
Cash Paid For Foreign Income Taxes	11,890,000	7,586,000	268,000
Unrecognized tax benefits	2,127,000	85,000
unrecognized tax benefits primarily associated with state taxes	0
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Net operating losses included in deferred tax assets	0
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating losses included in deferred tax assets	554,000
Capital Loss Carryforward [Member]
Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance	2,935,000
Capital Loss Carryforward [Member]
Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance	2,046,000
Valuation Allowance, Other Tax Carryforward [Member]
Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance	415,000
Capital Loss Carryforward Related to Business Acquisition [Member]
Income Taxes [Line Items]
Operating loss carryforwards, federal	$ 33,736,000