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Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Tax Expense (Benefit) [Abstract]
Provision for income taxes	$ 4,743,000	$ 3,837,000	$ 9,254,000	$ 7,687,000
Payment of withholding taxes to foreign tax authorities	3,800,000	3,700,000	7,600,000	8,100,000
Net deferred tax assets, before valuation allowance	211,000,000		211,000,000
Unrecognized tax benefits	16,700,000		16,700,000		16,800,000
Unrecognized tax benefits, reduction of long-term deferred tax assets	10,600,000		10,600,000		10,600,000
Unrecognized tax benefits included in long-term income taxes payable	6,100,000		6,100,000		6,200,000
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit	$ 2,000,000		$ 2,000,000

X

- Definition

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

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

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-Section 08

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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph a, b

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6527854



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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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