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Borrowings - Components of long-term debt (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 26, 2016	May 16, 2016	Dec. 31, 2015	Jun. 28, 2015
Debt Instrument [Line Items]
Total borrowings	$ 1,097,462		$ 1,088,941
Less: Unamortized debt discount on 3.875% Convertible Senior Subordinated Notes due 2017	(4,956)		(22,999)
Less: Unamortized debt issuance costs	(10,624)		(6,742)
Total long-term debt	1,081,882		1,059,200
Current borrowings	(173,952)		(417,350)
Long-term borrowings	907,930		641,850
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, at a rate of 1.95% at June 26, 2016, due 2018	$ 268,000		396,000
Line of credit facility interest rate	1.95%
Securitization Program
Debt Instrument [Line Items]
Securitization program, at a rate of 1.20% at June 26, 2016	$ 43,300		$ 43,300
Debt instrument, stated interest rate	1.20%		1.18%
5.25% Senior Notes due 2024 \| Senior Notes
Debt Instrument [Line Items]
Senior Notes	$ 250,000		$ 250,000
Debt instrument, stated interest rate	5.25%		5.25%
3.875% Convertible Senior Subordinated Notes due 2017 \| Senior Notes
Debt Instrument [Line Items]
3.875% Convertible Senior Subordinated Notes due 2017	$ 136,162		$ 399,641
Debt instrument, stated interest rate	3.875%		3.875%	3.875%
4.875% Senior Notes due 2026 \| Senior Notes
Debt Instrument [Line Items]
Senior Notes	$ 400,000		$ 0
Debt instrument, stated interest rate	4.875%	4.875%