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Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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, Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to shareholders | $ 116,177 us-gaap_NetIncomeLoss | [1] | $ 146,864 us-gaap_NetIncomeLoss | [2] | $ 127,884 us-gaap_NetIncomeLoss | [3] | $ 107,120 us-gaap_NetIncomeLoss | [4] | $ 134,831 us-gaap_NetIncomeLoss | [5] | $ 96,779 us-gaap_NetIncomeLoss | [6] | $ 89,935 us-gaap_NetIncomeLoss | [7] | $ 77,875 us-gaap_NetIncomeLoss | [8] | $ 498,045 us-gaap_NetIncomeLoss |  | $ 399,420 us-gaap_NetIncomeLoss |  | $ 506,332 us-gaap_NetIncomeLoss |
Weight-average shares outstanding - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98,675 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 102,559 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 109,240 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Net effect of various dilutive stock-based compensation awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,272 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  | 1,140 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  | 1,837 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
Weighted average shares outstanding - diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,947 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 103,699 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 111,077 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Net Income per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ 1.20 us-gaap_EarningsPerShareBasic | [1],[9] | $ 1.49 us-gaap_EarningsPerShareBasic | [2],[9] | $ 1.29 us-gaap_EarningsPerShareBasic | [3],[9] | $ 1.07 us-gaap_EarningsPerShareBasic | [4],[9] | $ 1.34 us-gaap_EarningsPerShareBasic | [5] | $ 0.96 us-gaap_EarningsPerShareBasic | [6] | $ 0.87 us-gaap_EarningsPerShareBasic | [7] | $ 0.74 us-gaap_EarningsPerShareBasic | [8] | $ 5.05 us-gaap_EarningsPerShareBasic |  | $ 3.89 us-gaap_EarningsPerShareBasic |  | $ 4.64 us-gaap_EarningsPerShareBasic |
Diluted | $ 1.18 us-gaap_EarningsPerShareDiluted | [1],[9] | $ 1.47 us-gaap_EarningsPerShareDiluted | [2],[9] | $ 1.27 us-gaap_EarningsPerShareDiluted | [3],[9] | $ 1.06 us-gaap_EarningsPerShareDiluted | [4],[9] | $ 1.32 us-gaap_EarningsPerShareDiluted | [5] | $ 0.95 us-gaap_EarningsPerShareDiluted | [6] | $ 0.86 us-gaap_EarningsPerShareDiluted | [7] | $ 0.72 us-gaap_EarningsPerShareDiluted | [8] | $ 4.98 us-gaap_EarningsPerShareDiluted | [10] | $ 3.85 us-gaap_EarningsPerShareDiluted | [10] | $ 4.56 us-gaap_EarningsPerShareDiluted | [10]
Stock Compensation Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 294 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember |  | 874 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember |  | 1,424 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember |
[1] | restructuring, integration, and other charges ($11,222 net of related taxes or $.12 and $.11 per share on a basic and diluted basis, respectively)
[2] | restructuring, integration, and other charges ($2,556 net of related taxes or $.03 per share on both a basic and diluted basis)
[3] | restructuring, integration, and other charges ($7,526 net of related taxes or $.08 and $.07 per share on a basic and diluted basis, respectively).
[4] | Includes amortization expense related to identifiable intangible assets ($8,907 net of related taxes or $.09 per share on both a basic and diluted basis) and restructuring, integration, and other charges ($8,020 net of related taxes or $.08 per share on both a basic and diluted basis)
[5] | restructuring, integration, and other charges ($13,341 net of related taxes or $.13 per share on both a basic and diluted basis). Also included is an increase in the provision for income taxes ($15,447 net of related taxes or $.16 per share on both a basic and diluted basis) and interest expense ($297 net of related taxes) related to the settlement of certain international tax matters.
[6] | Includes amortization expense related to identifiable intangible assets ($7,074 net of related taxes or $.07 per share on both a basic and diluted basis) and restructuring, integration, and other charges ($16,077 net of related taxes or $.16 per share on both a basic and diluted basis).
[7] | Includes amortization expense related to identifiable intangible assets ($7,029 net of related taxes or $.07 per share on both a basic and diluted basis) and restructuring, integration, and other charges ($20,688 net of related taxes or $.20 per share on both a basic and diluted basis).
[8] | restructuring, integration, and other charges ($15,495 net of related taxes or $.15 and $.14 per share on a basic and diluted basis, respectively), and a loss on prepayment of debt ($2,627 net of related taxes or $.02 per share on both a basic and diluted basis).
[9] | Quarterly net income per share is calculated using the weighted-average shares outstanding during each quarterly period, while net income per share for the full year is calculated using the weighted-average shares outstanding during the year. Therefore, the sum of the net income per share for each of the four quarters may not equal the net income per share for the full year.
[10] | Stock-based compensation awards for the issuance of 294 shares, 874 shares, and 1,424 shares for the years ended December 31, 2014, 2013, and 2012, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.

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