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Goodwill and Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 26, 2016
Apr. 01, 2017
Dec. 31, 2016
Other intangible assets      
Gross   $ 611,494 $ 623,870
Accumulated Amortization   (241,681) (229,422)
Net   369,813 394,448
Impairment charge $ 1,900    
Backlog      
Other intangible assets      
Gross   7,782 8,370
Accumulated Amortization   (7,351) (6,390)
Net   431 1,980
Backlog | CDMO Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Other intangible assets      
Decrease in intangible assets resulting from divestiture of business   300  
Technology      
Other intangible assets      
Gross   72,241 71,425
Accumulated Amortization   (17,171) (14,314)
Net   55,070 57,111
Trademarks and trade names      
Other intangible assets      
Gross   8,271 8,177
Accumulated Amortization   (4,204) (4,124)
Net   4,067 4,053
Other      
Other intangible assets      
Gross   16,794 16,775
Accumulated Amortization   (6,026) (5,628)
Net   10,768 11,147
Other intangible assets      
Other intangible assets      
Gross   105,088 104,747
Accumulated Amortization   (34,752) (30,456)
Net   70,336 74,291
Client relationships      
Other intangible assets      
Gross   506,406 519,123
Accumulated Amortization   (206,929) (198,966)
Net   299,477 $ 320,157
Client relationships | CDMO Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Other intangible assets      
Decrease in intangible assets resulting from divestiture of business   $ 16,800