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Borrowings (Narrative) (Details) (USD $)	6 Months Ended		1 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended			6 Months Ended		1 Months Ended	6 Months Ended
	Jun. 26, 2011	Dec. 31, 2010	Mar. 31, 2011 Maximum [Member] Extension Of Senior Credit Facility [Member]	Mar. 31, 2011 Minimum [Member] Extension Of Senior Credit Facility [Member]	Jun. 26, 2011 6.875% Senior Subordinated Notes Due 2019 [Member]	Jun. 26, 2011 6.875% Senior Subordinated Notes Due 2019 [Member]	Jun. 26, 2011 Term Loan [Member]	Jun. 26, 2011 3.875% Convertible Senior Subordinated Notes Due 2017 [Member]	Dec. 31, 2010 3.875% Convertible Senior Subordinated Notes Due 2017 [Member]	Mar. 27, 2011 2004 Senior Notes [Member]	Jun. 26, 2011 2004 Senior Notes [Member]	Jun. 26, 2011 Senior Credit Facility, Term Loan Facility, At An Average Rate Of 1.31%, Due 10/1/2012 [Member]	Mar. 31, 2011 Senior Credit Facility, Term Loan Facility, At An Average Rate Of 1.31%, Due 10/1/2012 [Member]	Dec. 31, 2010 Senior Credit Facility, Term Loan Facility, At An Average Rate Of 1.31%, Due 10/1/2012 [Member]	Jun. 26, 2011 Senior Credit Facility, Term Loan Facility, At An Average Rate Of 2.56%, Due 10/1/2014 [Member]	Dec. 31, 2010 Senior Credit Facility, Term Loan Facility, At An Average Rate Of 2.56%, Due 10/1/2014 [Member]	Mar. 31, 2011 Incremental Facility [Member]	Jun. 26, 2011 Incremental Facility [Member]	Jun. 26, 2011 Extension Of Senior Credit Facility [Member]	Mar. 31, 2011 Extension Of Senior Credit Facility [Member]	Mar. 27, 2011 Revolving Credit Facility [Member]	Jun. 26, 2011 Revolving Credit Facility [Member] Standby Letters Of Credit [Member]
6.875% Senior Subordinated Notes due 2019	$ 250,000,000				$ 250,000,000	$ 250,000,000
Annual interest rate	6.875%				6.875%	6.875%		3.875%				1.31%			2.56%
Debt maturity date	October 1, 2014					June 1, 2019		2017				10/1/2012			10/1/2014
Transaction fees						4,200,000
Prepayment of debt										165,800,000
Write-off of unamortized debt issuance costs incurred					800,000					13,900,000
Unamortized debt issuance costs								75,134,000	79,891,000	700,000
Percent of redemption price to principal amount any time on or after June 1, 2015						103.438%
Declining percent of redemption price to principal amount on June1, 2017						100.00%
Percent of redemption price to principal amount on redemption at any time prior to June 1, 2015						100.00%
Percent of principal amount of Notes subject to redemption						1.00%
Redemption, basis points					50.00%	50.00%
Percent of redemption price of the principal amount of the Notes redeemed, plus accrued and unpaid interest						106.875%
Percent of principal amount of notes redeemable						35.00%
Revolving credit facility											150,000,000		36,100,000	36,123,000	375,000,000	363,877,000				33,700,000	165,000,000	3,000,000
Repayment of borrowings under senior credit facilities							125,000,000										80,000,000
Company incurred transaction fees deferred for future amortization																			300,000
Interest rate terms																		Interest on the term loans bear interest at an applicable rate elected by the Company equal to either the "base rate" (the greater of either the federal funds effective rate plus 0.5%, the prime rate or one month LIBOR plus 1.0%) plus an applicable margin of 0.50% to 1.75%, or a "LIBOR rate" for the period corresponding to the applicable interest period of the borrowings plus an applicable margin of 1.50% to 2.75%. The actual amount of the applicable margin will be based on the ratio of Consolidated Total Indebtedness to Consolidated EBITDA (each as defined in the Credit Agreement). At June 26, 2011, all outstanding term loans were subject to the "LIBOR rate" of 0.3125% plus an applicable margin of 2.25%, resulting in an interest rate of 2.5625%.
Additional borrowings on Convertible Notes																	100,000,000
Revolving credit facility under VasoNova acquisition																					400,000,000
Commitment fee	0.375%		0.50%	0.375%
Carrying amount of long-term debt	949,866,000	813,409,000
Fair value of long-term debt	$ 1,081,600,000

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Increase for additional borrowings on the debt instrument during the period.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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Amount borrowed under the credit facility as of the balance sheet date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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