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Acquisitions Acquisitions - (Details) - acquisition | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Number of acquisitions | 4 | 1

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- References No definition available. + Details
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Period Type: | duration

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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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