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Intangible Asset and Goodwill (Details 3) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended |  |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended |  |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Existing technology | Jun. 30, 2013 Existing technology | Dec. 31, 2012 Existing technology | Jun. 30, 2013 Existing technology Minimum | Dec. 31, 2012 Existing technology Minimum | Jun. 30, 2013 Existing technology Maximum | Dec. 31, 2012 Existing technology Maximum | Jun. 30, 2013 Customer contracts and contractual relationships | Dec. 31, 2012 Customer contracts and contractual relationships | Jun. 30, 2013 Customer contracts and contractual relationships Minimum | Dec. 31, 2012 Customer contracts and contractual relationships Minimum | Jun. 30, 2013 Customer contracts and contractual relationships Maximum | Dec. 31, 2012 Customer contracts and contractual relationships Maximum | Jun. 30, 2013 Non-compete agreements | Dec. 31, 2012 Non-compete agreements | Jun. 30, 2012 Favorable contracts | Jun. 30, 2013 Favorable contracts | Jun. 30, 2012 Favorable contracts | Dec. 31, 2012 Favorable contracts | Jun. 30, 2012 Various Acquisitions
Components of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful Life (in years) |  |  |  |  |  |  |  |  | 3 years | 3 years | 10 years | 10 years |  |  | 1 year | 1 year | 10 years | 10 years | 3 years | 3 years |  |  |  |  |
Gross Carrying Amount | $ 226,295,000 |  | $ 226,295,000 |  | $ 224,765,000 | $ 193,345,000 | $ 193,345,000 | $ 191,815,000 |  |  |  |  | $ 32,650,000 | $ 32,650,000 |  |  |  |  | $ 300,000 | $ 300,000 |  |  |  |  |
Accumulated Amortization | (86,900,000) |  | (86,900,000) |  | (71,592,000) | (69,728,000) | (69,728,000) | (57,240,000) |  |  |  |  | (16,964,000) | (14,194,000) |  |  |  |  | (208,000) | (158,000) |  |  |  |  |
Net Carrying Amount | 139,395,000 |  | 139,395,000 |  | 153,173,000 | 123,617,000 | 123,617,000 | 134,575,000 |  |  |  |  | 15,686,000 | 18,456,000 |  |  |  |  | 92,000 | 142,000 |  |  |  |  |
Intangible asset purchased |  |  |  |  |  | 600,000 | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of intellectual property |  |  | 2,250,000 | 0 |  | 250,000 | 2,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations and asset acquisitions, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,200,000
Cash received related to favorable contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 | 1,400,000 | 3,600,000 |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,400,000 |  | 4,800,000 |
Amortization expense for intangible assets | $ 7,000,000 | $ 7,900,000 | $ 14,037,000 | $ 15,559,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The aggregate amount assigned to a major class of finite-lived intangible assets acquired 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 Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -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. + 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=6943989&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=7658586&loc=d3e16323-109275 Reference 4: 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. + Details
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- Definition This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 39, 40 -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. + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=7658586&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(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. + Details
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