Financial Instruments Measured at Fair Value - Derivatives (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 02, 2016	Jun. 27, 2015	Jul. 02, 2016	Jun. 27, 2015	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Notional Amount		$ 367,332		$ 367,332		$ 382,025
Derivative, Fair Value, Net		4,391		4,391		(27)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		1,455		1,455		1,035
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		$ 2,936		$ 2,936		(1,062)
3.375% notes, due 2015 [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.375%		3.375%
Notes Due in 2020 [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.00%		6.00%
Senior Debentures Due in 2018 [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.875%		6.875%
Interest Rate Swaps Converting Notes Due in 2015 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		$ 200,000		$ 200,000
Debt Instrument, Interest Rate, Stated Percentage		1.98%		1.98%
Cash received upon termination of 2015 swaps				$ 896
Amortization of Deferred Hedge Gains		$ 30	$ 30	59	$ 39
Interest rate swaps designated as fair value hedges [Member] | Notes Due in 2020 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		50,000		50,000
Derivative, Fair Value, Net		$ 1,758		$ 1,758
Debt Instrument, Interest Rate, Effective Percentage		4.88%		4.88%
Interest rate swaps designated as fair value hedges [Member] | Senior Debentures Due in 2018 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		$ 50,000		$ 50,000
Derivative, Fair Value, Net		$ 494		$ 494
Debt Instrument, Interest Rate, Effective Percentage		6.41%		6.41%
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	[1]	$ 4,660	(1,187)	$ 1,612	(379)
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	[1]	4,660	(1,187)	1,612	(379)
Foreign Exchange Contract [Member] | Other Current Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		4,764		4,764		1,729
Foreign Exchange Contract [Member] | Accrued Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		(1,828)		(1,828)		(2,791)
Interest rate swaps designated as fair value hedges [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		0		0		0
Interest rate swaps designated as fair value hedges [Member] | Interest Rate Swap [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		2,252		2,252		711
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net	[2]	0	0	0	827
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[2]	(150)	(141)	(299)	(302)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	[2]		0		69
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net	[3]	543	(2,245)	(534)	437
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[3]	(469)	163	(1,091)	(678)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	[3]		$ 0		$ 0
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		77		77		896
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Accrued Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		$ (874)		$ (874)		$ (572)

[1] The amount of gain (loss) recognized in income on derivatives is recorded in "Cost of sales" in the company's consolidated statements of operations.

[2] Both the effective and ineffective portions of any gain (loss) reclassified or recognized in income are recorded in "Interest and other financing expense, net" in the company's consolidated statements of operations. The gain (loss) amounts reclassified into income relate to the termination of swaps.

[3] Both the effective and ineffective portions of any gain (loss) reclassified or recognized in income are recorded in "Cost of sales" in the company's consolidated statements of operations.