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Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Other Intangible Assets |  |  |  |  |
Gross Carrying Amount | $ 121,302 |  | $ 121,302 |  | $ 121,302
Accumulated Amortization | (57,745) |  | (57,745) |  | (54,359)
Total amortization expense | 63,557 |  | 63,557 |  | 66,943
Amortization expense | 1,704 | $ 1,613 | 3,424 | $ 3,149 |
Customer lists/relationships |  |  |  |  |
Other Intangible Assets |  |  |  |  |
Gross Carrying Amount | 64,323 |  | 64,323 |  | 64,323
Accumulated Amortization | (35,387) |  | (35,387) |  | (33,685)
Total amortization expense | 28,936 |  | 28,936 |  | 30,638
Patents |  |  |  |  |
Other Intangible Assets |  |  |  |  |
Gross Carrying Amount | 10,319 |  | 10,319 |  | 10,319
Accumulated Amortization | (10,319) |  | (10,319) |  | (10,319)
Total amortization expense | 0 |  | 0 |  | 0
Technology and other intangibles |  |  |  |  |
Other Intangible Assets |  |  |  |  |
Gross Carrying Amount | 44,460 |  | 44,460 |  | 44,460
Accumulated Amortization | (12,039) |  | (12,039) |  | (10,355)
Total amortization expense | 32,421 |  | 32,421 |  | 34,105
In process research and development |  |  |  |  |
Other Intangible Assets |  |  |  |  |
Gross Carrying Amount |  |  |  |  | 2,200
Total amortization expense | 2,200 |  | 2,200 |  | $ 2,200
Indefinite-Lived Intangible Assets (Excluding Goodwill) | $ 2,200 |  | $ 2,200 |  |

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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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