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Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Income Taxes
Effective tax rate (as a percent)	(24.60%)	(23.70%)	(148.90%)	25.80%
Payment of withholding taxes to foreign tax authorities	$ 4,100,000		$ 8,200,000
Provision for income tax	2,088,000	2,393,000	8,864,000	48,069,000
Net deferred tax assets, before valuation allowance	131,600,000		131,600,000		78,300,000
Unrecognized tax benefits	13,100,000		13,100,000		11,800,000
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit	8,400,000		8,400,000		7,200,000
Unrecognized tax benefits included in long-term income taxes payable	4,700,000		4,700,000		4,600,000
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit	$ 2,800,000		$ 2,800,000

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The amount of cash paid during the current period to foreign tax authorities related to the payments received from the customers.

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Represents the amount of unrecognized tax benefits which pertained to uncertain tax positions taken in tax return and was included in long-term income taxes payable as of the balance date.

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Represents the amount of unrecognized tax benefits which pertained to uncertain tax positions taken in tax returns and was recorded as a reduction of long-term deferred tax assets as of the balance sheet date, prior to reduction for federal tax benefit.

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For entities that net deferred tax assets and tax liabilities, represents the unclassified net amount of deferred tax assets and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities. A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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