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Stockholders' Equity AOCI Disclosure (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent |  | $ 105,665 | $ 106,502 |  | $ 118,176 |  | $ 116,540
Amortization of Intangible Assets |  | 4,312 | 4,956 |  | 5,526 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 5,492 | (9,209) |  | (4,153) |  |
Interest Rate Swap |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent |  | (69) | (158) |  | (238) |  | (295)
OCI, before Reclassifications, Net of Tax, Attributable to Parent |  | 12 | (20) |  | (58) |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | [1] | 77 | 100 |  | 115 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 89 | 80 |  | 57 |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent |  | (11,317) | (16,809) |  | (7,600) |  | (3,447)
OCI, before Reclassifications, Net of Tax, Attributable to Parent |  | 5,415 | (9,309) |  | (4,268) |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  | 77 | 100 | [1] | 115 | [1] |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 5,492 | (9,209) |  | (4,153) |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent |  | (11,247) | (16,651) |  | (7,363) |  | (3,156)
OCI, before Reclassifications, Net of Tax, Attributable to Parent |  | 5,404 | (9,288) |  | (4,207) |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | [1] | 0 | 0 |  | 0 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 5,404 | (9,288) |  | (4,207) |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent |  | (1) | 0 |  | 1 |  | $ 4
OCI, before Reclassifications, Net of Tax, Attributable to Parent |  | (1) | (1) |  | (3) |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | [1] | 0 | 0 |  | 0 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | $ (1) | $ (1) |  | $ (3) |  |
[1] | For additional information, see Note 2, "Marketable Securities", and see Note 15, "Derivative Instruments and Hedging Activities"

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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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