Fair Value Measurements (Details 3) (USD $)
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3 Months Ended | 9 Months Ended | ||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
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Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
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Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
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Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
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Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
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Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
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Business Acquisition, Contingent Consideration [Line Items] | ||||||||||
Fair value, beginning of period | $ 281,000,000 | $ 281,000,000 | $ 293,900,000 | $ 290,300,000 | $ 280,900,000 | $ 151,000,000 | ||||
Additions | 0 | 0 | 0 | 122,200,000 | ||||||
(Gain) loss on fair value remeasurement of contingent consideration | (97,000) | 9,456,000 | (2,983,000) | 23,573,000 | ||||||
Payments | 100,000 | 0 | (9,900,000) | (6,500,000) | ||||||
Fair value, end of period | $ 281,000,000 | $ 281,000,000 | $ 293,900,000 | $ 290,300,000 | $ 280,900,000 | $ 151,000,000 |