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Intangible Asset and Goodwill (Details 3) (USD $) | 3 Months Ended |  |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended |
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Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Existing technology | Dec. 31, 2013 Existing technology | Mar. 31, 2014 Existing technology Minimum | Dec. 31, 2013 Existing technology Minimum | Mar. 31, 2014 Existing technology Maximum | Dec. 31, 2013 Existing technology Maximum | Mar. 31, 2014 Customer contracts and contractual relationships | Dec. 31, 2013 Customer contracts and contractual relationships | Mar. 31, 2014 Customer contracts and contractual relationships Minimum | Dec. 31, 2013 Customer contracts and contractual relationships Minimum | Mar. 31, 2014 Customer contracts and contractual relationships Maximum | Dec. 31, 2013 Customer contracts and contractual relationships Maximum | Mar. 31, 2014 Non-compete agreements | Dec. 31, 2013 Non-compete agreements | Mar. 31, 2014 Favorable contracts | Mar. 31, 2013 Favorable contracts | Dec. 31, 2013 Favorable contracts
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 | $ 216,714,000 |  | $ 217,595,000 | $ 185,321,000 | $ 186,202,000 |  |  |  |  | $ 31,093,000 | $ 31,093,000 |  |  |  |  | $ 300,000 | $ 300,000 |  |  |
Accumulated Amortization | (107,454,000) |  | (100,423,000) | (86,476,000) | (80,961,000) |  |  |  |  | (20,695,000) | (19,204,000) |  |  |  |  | (283,000) | (258,000) |  |  |
Net Carrying Amount | 109,260,000 |  | 117,172,000 | 98,845,000 | 105,241,000 |  |  |  |  | 10,398,000 | 11,889,000 |  |  |  |  | 17,000 | 42,000 | 100,000 |  | 1,000,000
Cash received related to favorable contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 | 1,400,000 |
Amortization expense for intangible assets | $ 6,797,000 | $ 7,040,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the cash received on account of intangible assets. + References No definition available. + 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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- Definition Accumulated amount of 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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before 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=26713463&loc=d3e16323-109275 + 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=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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