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Acquisitions (Summary) - Additional Information (Details)
12 Months Ended
Dec. 31, 2016
Minimum [Member]  
Business Acquisition [Line Items]  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 10 years
Maximum [Member]  
Business Acquisition [Line Items]  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years