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Goodwill and Intangibles - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016
Intangible assets |  |  |  |  |  |
Amortization expense | $ 36,900 | $ 43,100 | $ 28,300 |  |  |
Intangible assets: |  |  |  |  |  |
Cost | 275,320 | 272,144 |  |  |  |
Accumulated Amortization | (143,153) | (109,176) |  |  |  |
Net | 132,167 | 162,968 |  | $ 186,165 | $ 194,391 | $ 204,361
Impairment charges on long lived assets | 1,000 | 11,100 | $ 0 |  |  |
Technology |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |
Cost | 124,799 | 129,382 |  |  |  |
Accumulated Amortization | (70,608) | (53,142) |  |  |  |
Net | 54,191 | 76,240 |  |  |  |
Customer lists and relationships |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |
Cost | 128,170 | 129,650 |  |  |  |
Accumulated Amortization | (62,905) | (49,852) |  |  |  |
Net | 65,265 | 79,798 |  |  |  |
Capitalized software and patents |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |
Cost | 19,792 | 10,589 |  |  |  |
Accumulated Amortization | (7,115) | (3,923) |  |  |  |
Net | 12,677 | 6,666 |  |  |  |
Trade name |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |
Cost | 2,559 | 2,523 |  |  |  |
Accumulated Amortization | (2,525) | (2,259) |  |  |  |
Net | $ 34 | $ 264 |  |  |  |

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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 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: 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=98514028&loc=d3e3602-108585 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=66006027&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=66006027&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=66006027&loc=d3e16323-109275 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84241808&loc=d3e92212-112881 Reference 2: 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=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 + Details
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