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Goodwill and Intagible Assets Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 105 |
Amortization of Intangible Assets | $ 1,096 | $ 1,145 | 3,266 | $ 3,678
General and administrative |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of Intangible Assets | 721 | 770 | 2,169 | 2,434
Cost of service sales |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of Intangible Assets | $ 375 | $ 375 | 1,097 | $ 1,244
Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 100 |

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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=66902209&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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