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Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure Net Deferred Tax Assets Liabilities [Abstract] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 700 | $ 600
Non-current deferred tax assets | 6,863 | 2,910
Non-current deferred tax liabilities | 118,528 | 152,172
Non-current deferred tax liabilities | (111,665) | (149,262)
Deferred Tax Liabilities, Net | $ (111,665) | $ (149,262)

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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31931-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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