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Cost in Excess of Net Assets of Companies Acquired and Intangible Assets, net Cost in Excess of Net Assets of Companies Acquired and Intangible Assets, net - Intangible Assets (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 31, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount | $ 567,478 |  |  |  |  | $ 518,424 |  |  |  |  | $ 567,478 |  | $ 518,424 |  |
Accumulated amortization | (141,409) |  |  |  |  | (104,391) |  |  |  |  | (141,409) |  | (104,391) |  |
Intangible assets, net | 426,069 |  |  |  |  | 414,033 |  |  |  |  | 426,069 |  | 414,033 |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  |  |  |  | 36,769 |  | 36,508 |  | 35,359
Amortization of Intangible Assets Net of Tax | 8,120 |  | 7,074 | 7,029 | 7,116 | 7,255 |  | 7,145 | 7,360 | 7,576 | 29,339 |  | 29,336 |  | 27,070
Amortization of Intangible Assets Net of Tax Per Share Basic and Diluted | $ 0.08 |  | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.07 |  | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.29 |  | $ 0.27 |  | $ 0.24
Amortization of Intangible Assets Net of Tax Per Share Diluted |  |  |  |  |  |  |  |  |  |  | $ 0.28 |  | $ 0.26 |  | $ 0.23
Future Amortization Expense, Year One | 42,375 |  |  |  |  |  |  |  |  |  | 42,375 |  |  |  |
Future Amortization Expense, Year Two | 41,101 |  |  |  |  |  |  |  |  |  | 41,101 |  |  |  |
Future Amortization Expense, Year Three | 39,002 |  |  |  |  |  |  |  |  |  | 39,002 |  |  |  |
Future Amortization Expense, Year Four | 35,207 |  |  |  |  |  |  |  |  |  | 35,207 |  |  |  |
Future Amortization Expense, Year Five | 29,282 |  |  |  |  |  |  |  |  |  | 29,282 |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life |  |  |  |  |  |  |  |  |  |  | 11 years |  | 11 years |  |
Gross carrying amount | 374,244 |  |  |  |  | 325,509 |  |  |  |  | 374,244 |  | 325,509 |  |
Accumulated amortization | (134,817) |  |  |  |  | (100,172) |  |  |  |  | (134,817) |  | (100,172) |  |
Intangible assets, net | 239,427 |  |  |  |  | 225,337 |  |  |  |  | 239,427 |  | 225,337 |  |
Patented Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life |  |  |  |  |  |  |  |  |  |  | 5 years |  | 5 years |  |
Gross carrying amount | 9,625 |  |  |  |  | 11,154 |  |  |  |  | 9,625 |  | 11,154 |  |
Accumulated amortization | (4,051) |  |  |  |  | (2,508) |  |  |  |  | (4,051) |  | (2,508) |  |
Intangible assets, net | 5,574 |  |  |  |  | 8,646 |  |  |  |  | 5,574 |  | 8,646 |  |
Other Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount | 4,609 | [1] |  |  |  | 2,761 | [1] |  |  |  | 4,609 | [1] | 2,761 | [1] |
Accumulated amortization | (2,541) | [1] |  |  |  | (1,711) | [1] |  |  |  | (2,541) | [1] | (1,711) | [1] |
Intangible assets, net | 2,068 | [1] |  |  |  | 1,050 | [1] |  |  |  | 2,068 | [1] | 1,050 | [1] |
Acquired Finite-lived Intangible Asset, Useful Life, Minimum |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Acquired Finite-lived Intangible Asset, Useful Life, Maximum |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount | 179,000 |  |  |  |  | 179,000 |  |  |  |  | 179,000 |  | 179,000 |  |
Accumulated amortization | 0 |  |  |  |  | 0 |  |  |  |  | 0 |  | 0 |  |
Intangible assets, net | $ 179,000 |  |  |  |  | $ 179,000 |  |  |  |  | $ 179,000 |  | $ 179,000 |  |
[1] | Consists of non-competition agreements and sales backlog with useful lives ranging from one to three years.

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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