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Goodwill, Intangible Assets and In-Process Revenue Contracts (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010
Acquired finite lived intangible assets by major class |  |
Weighted-Average Amortization Period | 15 years 2 months | 13 years 5 months
Gross carrying amount | $ 341,245 | $ 358,515
Accumulated Amortization | (204,503) | (202,622)
Net Carrying Amount | 136,742 | 155,893
Customer Contracts [Member] |  |
Acquired finite lived intangible assets by major class |  |
Weighted-Average Amortization Period | 15 years 6 months | 13 years 7 months
Gross carrying amount | 329,815 | 347,085
Accumulated Amortization | (194,266) | (195,358)
Net Carrying Amount | 135,549 | 151,727
Other Intangible Assets [Member] |  |
Acquired finite lived intangible assets by major class |  |
Weighted-Average Amortization Period | 4 years 5 months | 4 years 5 months
Gross carrying amount | 11,430 | 11,430
Accumulated Amortization | (10,237) | (7,264)
Net Carrying Amount | $ 1,193 | $ 4,166

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- Definition The accumulated amount of amortization of a major finite-lived intangible asset class. 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of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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- Definition Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. 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 45 -Subparagraph a(1) -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 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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