Intangible Assets and Goodwill (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of intangible assets
Gross Carrying Amount	$ 216,714	$ 217,595
Accumulated Amortization	(127,343)	(100,423)
Finite-lived intangible assets	89,371us-gaap_FiniteLivedIntangibleAssetsNet	117,172us-gaap_FiniteLivedIntangibleAssetsNet
Amortization expense for intangible assets	26,618us-gaap_AmortizationOfIntangibleAssets	28,909us-gaap_AmortizationOfIntangibleAssets	30,345us-gaap_AmortizationOfIntangibleAssets
Minimum
Components of intangible assets
Useful Life (in years)	1 year	1 year
Maximum
Components of intangible assets
Useful Life (in years)	10 years	10 years
Existing technology
Components of intangible assets
Gross Carrying Amount	185,321	186,202
Accumulated Amortization	(104,426)	(80,961)
Finite-lived intangible assets	80,895	105,241
Existing technology \| Minimum
Components of intangible assets
Useful Life (in years)	3 years	3 years
Existing technology \| Maximum
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
Accumulated Amortization	(22,617)	(19,204)
Finite-lived intangible assets	8,476	11,889
Customer contracts and contractual relationships \| Minimum
Components of intangible assets
Useful Life (in years)	1 year	1 year
Customer contracts and contractual relationships \| Maximum
Components of intangible assets
Useful Life (in years)	10 years	10 years
Non-competition agreements
Components of intangible assets
Gross Carrying Amount	300	300
Accumulated Amortization	(300)	(258)
Finite-lived intangible assets	$ 0	$ 42
Useful Life (in years)	3 years	3 years

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.

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

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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

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

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