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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share Reconciliation [Abstract]
Net income	$ 151,292us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 113,497us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 96,529us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 70,302us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 141,582us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 98,048us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 89,314us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 121,059us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 431,620us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 450,003us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 461,443us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income per basic common share	$ 1.82us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 1.36us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 1.14us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.83us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 1.67us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 1.15us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 1.04us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 1.41us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 5.12us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 5.27us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 5.25us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Net income per diluted common share	$ 1.80us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 1.34us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 1.13us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.82us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 1.65us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 1.14us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 1.03us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 1.39us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 5.07us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 5.20us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 5.19us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Weighted-average number of basic common shares	83,217,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	83,663,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	84,462,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	84,977,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	85,006,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	85,185,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	85,482,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	86,049,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	84,358,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	85,426,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	87,841,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive stock option, restricted stock and restricted stock unit securities									793,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	1,120,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	1,138,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted-average number of diluted common shares and equivalents	84,015,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	84,401,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	85,177,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	85,873,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	86,017,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	86,364,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	86,576,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	87,215,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	85,151,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	86,546,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	88,979,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share									1,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1,100,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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