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Goodwill - Intangibles (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]          
Gross Carrying Amount $ 536,189   $ 536,189   $ 549,916
Accumulated Amortization (207,225)   (207,225)   (263,701)
Net 328,964   328,964   $ 286,215
Amortization of Intangible Assets 11,955 $ 12,364 $ 25,475 $ 25,264  
Customer Relationships [Member]          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Weighted-Average Life     10 years   10 years
Gross Carrying Amount 426,441   $ 426,441   $ 440,167
Accumulated Amortization (201,988)   (201,988)   (259,337)
Net 224,453   $ 224,453   $ 180,830
Developed Technology [Member]          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Weighted-Average Life     5 years   5 years
Gross Carrying Amount 6,340   $ 6,340   $ 6,340
Accumulated Amortization (3,677)   (3,677)   (3,043)
Net 2,663   $ 2,663   $ 3,297
Amortizable Trade Name [Member]          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Weighted-Average Life     5 years   5 years
Gross Carrying Amount 2,408   $ 2,408   $ 2,409
Accumulated Amortization (1,560)   (1,560)   (1,321)
Net 848   848   1,088
Trade Names [Member]          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Gross Carrying Amount 101,000   101,000   101,000
Accumulated Amortization 0   0   0
Net $ 101,000   $ 101,000   $ 101,000