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Federal Income Taxes - Schedule of Valuation Allowance by Tax Jurisdiction (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Total valuation allowance | $ 68,121 | $ 99,548
United States [Member] |  |
Total valuation allowance | 60,920 | 92,448
Australia [Member] |  |
Total valuation allowance | 5,187 | 5,187
Turkey [Member] |  |
Total valuation allowance | $ 2,041 | $ 1,913

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- Definition Amount of valuation allowance of deferred tax asset attributable to deductible temporary differences and carryforwards, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31917-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31928-109318 + Details
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