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Investments in Equity-Method Investees (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |
Equity-method investment, interests | 66.70% |
Summarized data of combined balance sheet and results of operations for our equity-method investees [Abstract] |  |
Net income attributable to our equity investment in investee | $ 1,158 | $ 2,150
Equity-Method Investees [Member] |  |
Summarized data of combined balance sheet and results of operations for our equity-method investees [Abstract] |  |
Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 6,123 | 9,650
Total assets | 6,392 | 10,291
Total liabilities | 26 | 204
Equity Method Investment Summarized Financial Information, Equity | 6,366 | 10,087
Equity Method Investment, Summarized Financial Information, Revenue | 1,742 | 3,249
Net income | 1,370 | 2,714
Net income attributable to our equity investment in investee | $ 1,158 | $ 2,150

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- Definition The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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