Fair Value Measurements, Changes in Level 3 Liabilities Measured on a Recurring Basis (Details) (Contingent Consideration [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Changes in Level 3 Liabilities Measured at Fair Value on a Recurring Basis [Roll Forward]
Beginning balance	$ 51,555	$ 0
Fair value measured at conclusion of purchase price analysis measurement period	3,344
Fair value measured prior to conclusion of purchase price analysis measurement period		57,687
Fair value adjustments included in other income (expense), net	654	(6,132)
Contingent consideration settled	(12,929)
Ending balance	$ 42,624	$ 51,555
Minimum [Member] \| Income Approach Valuation Model [Member]
Fair Value Inputs [Abstract]
Fair value inputs, discount rate (in hundredths)	14.00%
Maximum [Member] \| Income Approach Valuation Model [Member]
Fair Value Inputs [Abstract]
Fair value inputs, discount rate (in hundredths)	18.00%

Fair value measured at conclusion of purchase price analysis measurement period.

No definition available.

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- Definition

Fair value measured prior to the conclusion of purchase price analysis measurement period.

+ References

No definition available.

+ Details

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

+ Details

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- Definition

Amount of gain (loss) recognized in earnings, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

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- Definition

This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

+ Details

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