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Intangible Asset and Goodwill (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Components of intangible assets |  |  |  |  |
Proceeds from Sale of Intangible Assets |  |  |  | $ 4,400 |
Gross Carrying Amount | $ 216,714 |  | $ 216,714 |  | $ 216,714
Accumulated Amortization | (140,020) |  | (140,020) |  | (127,343)
Net Carrying Amount | 76,694 |  | 76,694 |  | 89,371
Amortization expense for intangible assets | 6,322 | $ 6,757 | 12,645 | 13,554 |
Existing technology |  |  |  |  |
Components of intangible assets |  |  |  |  |
Gross Carrying Amount | 185,321 |  | 185,321 |  | 185,321
Accumulated Amortization | (115,835) |  | (115,835) |  | (104,426)
Net Carrying Amount | 69,486 |  | $ 69,486 |  | $ 80,895
Existing technology | Minimum [Member] |  |  |  |  |
Components of intangible assets |  |  |  |  |
Useful Life (in years) |  |  | 3 years |  | 3 years
Existing technology | Maximum [Member] |  |  |  |  |
Components of intangible assets |  |  |  |  |
Useful Life (in years) |  |  | 10 years |  | 10 years
Customer contracts and contractual relationships |  |  |  |  |
Components of intangible assets |  |  |  |  |
Gross Carrying Amount | 31,093 |  | $ 31,093 |  | $ 31,093
Accumulated Amortization | (23,885) |  | (23,885) |  | (22,617)
Net Carrying Amount | 7,208 |  | $ 7,208 |  | $ 8,476
Customer contracts and contractual relationships | Minimum [Member] |  |  |  |  |
Components of intangible assets |  |  |  |  |
Useful Life (in years) |  |  | 1 year |  | 1 year
Customer contracts and contractual relationships | Maximum [Member] |  |  |  |  |
Components of intangible assets |  |  |  |  |
Useful Life (in years) |  |  | 10 years |  | 10 years
Non-compete agreements |  |  |  |  |
Components of intangible assets |  |  |  |  |
Useful Life (in years) |  |  | 3 years |  | 3 years
Gross Carrying Amount | 300 |  | $ 300 |  | $ 300
Accumulated Amortization | (300) |  | (300) |  | (300)
Net Carrying Amount | 0 |  | 0 |  | 0
Favorable contracts |  |  |  |  |
Components of intangible assets |  |  |  |  |
Net Carrying Amount | 0 |  | 0 |  | $ 100
Cash received related to favorable contracts | $ 100 | $ 100 | $ 100 | $ 900 |

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