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Acquisitions & Divestitures (Details)
$ in Thousands
Mar. 27, 2015
USD ($)
Jun. 29, 2013
USD ($)
Mar. 20, 2013
USD ($)
Dec. 31, 2012
USD ($)
Business Acquisition        
Cash paid to acquire a business     $ 33,911 $ 34,550
Contingent consideration recognized, initial fair value       3,447
Issuance of unsecured note       $ 8,450
Proceeds from business divestiture $ 2,988 $ 5,000    
Note receivable issued in business divestiture   $ 200    
Number of businesses acquired     1 1