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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, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | $ 518,424 |  | $ 484,331 |  |
Accumulated amortization | (104,391) |  | (91,568) |  |
Intangible assets, net | 414,033 |  | 392,763 |  |
Amortization of Intangible Assets | 36,508 |  | 35,359 |  | 21,132
Future Amortization Expense, Year One | 36,165 |  |  |  |
Future Amortization Expense, Year Two | 35,584 |  |  |  |
Future Amortization Expense, Year Three | 35,207 |  |  |  |
Future Amortization Expense, Year Four | 33,570 |  |  |  |
Future Amortization Expense, Year Five | 29,816 |  |  |  |
Customer Relationships [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted Average Useful Life | 11 |  | 11 |  |
Gross carrying amount | 325,509 |  | 267,729 |  |
Accumulated amortization | (100,172) |  | (69,762) |  |
Intangible assets, net | 225,337 |  | 197,967 |  |
Patented Technology [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted Average Useful Life | 5 |  | 6 |  |
Gross carrying amount | 11,154 |  | 11,029 |  |
Accumulated amortization | (2,508) |  | (693) |  |
Intangible assets, net | 8,646 |  | 10,336 |  |
Procurement Agreement [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted Average Useful Life |  |  | 5 |  |
Gross carrying amount |  |  | 12,000 |  |
Accumulated amortization |  |  | (11,400) |  |
Intangible assets, net |  |  | 600 |  |
Other Intangible Assets [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 2,761 | [1] | 14,573 | [1] |
Accumulated amortization | (1,711) | [1] | (9,713) | [1] |
Intangible assets, net | 1,050 | [1] | 4,860 | [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 |  |
Accumulated amortization | 0 |  | 0 |  |
Intangible assets, net | $ 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 The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6905858&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 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=6943989&loc=d3e3602-108585 Reference 4: 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 + Details
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