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Acquired Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ 427 | $ 408 | $ 408
2018 | 442 |  |
2019 | 412 |  |
2020 | 406 |  |
2021 | 406 |  |
2022 | 88 |  |
Recorded intangible assets | 1,405 |  |
Customer Lists [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Recorded intangible assets | $ 355 |  |
Customer Lists [Member] | Minimum [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period | 7 years |  |
Customer Lists [Member] | Maximum [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period | 10 years |  |
Patents [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period | 18 years |  |
Noncompete Agreements [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Recorded intangible assets | $ 71 |  |
Noncompete Agreements [Member] | Minimum [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period | 2 years |  |
Noncompete Agreements [Member] | Maximum [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period | 5 years |  |
Software [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period | 3 years |  |
Other Intangible Assets [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period | 15 years |  |
Goodwill [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Recorded intangible assets | $ 979 |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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 Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition 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. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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