Income Taxes - Reconciliation of Gross Unrecognized Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
Beginning balance	$ 26,469	$ 24,260	$ 29,962
Gross increases for tax positions in prior periods	2,198	2,042	286
Gross decreases for tax positions in prior periods	(641)	(192)	(2,490)
Gross increases based on tax positions related to the current year	13,641	3,201	1,431
Gross decreases related to settlements with taxing authorities	(13,202)	(2,465)	(4,182)
Reductions due to statute expiration	(370)	(377)	(747)
Gross increases due to acquisitions	25,311
Ending balance	$ 53,406	$ 26,469	$ 24,260

Unrecognized Tax Benefits, Gross

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- Definition

The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

+ References

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

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Gross amount of increases in unrecognized tax benefits resulting from acquisitions.

+ References

No definition available.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

+ References

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

-Publisher FASB

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The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

+ References

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

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