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Fair Value Measurements (Details 3) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Fair Value, Measurements, Recurring | Mar. 31, 2014 Fair Value, Measurements, Recurring | Dec. 31, 2013 Fair Value, Measurements, Recurring | Jun. 30, 2013 Fair Value, Measurements, Recurring | Mar. 31, 2013 Fair Value, Measurements, Recurring | Dec. 31, 2012 Fair Value, Measurements, Recurring
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value, beginning of period |  |  |  |  | $ 279,100,000 | $ 275,100,000 | $ 280,900,000 | $ 281,000,000 | $ 293,700,000 | $ 293,900,000
Additions | 0 | 0 | 0 | 0 |  |  |  |  |  |
Changes in fair value | 4,019,000 | (5,163,000) | 3,220,000 | (2,886,000) |  |  |  |  |  |
Payments | 0 | (7,500,000) | (5,000,000) | (10,000,000) |  |  |  |  |  |
Fair value, end of period |  |  |  |  | $ 279,100,000 | $ 275,100,000 | $ 280,900,000 | $ 281,000,000 | $ 293,700,000 | $ 293,900,000

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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