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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Expense (Benefit) [Abstract] |  |  |
Current federal tax expense (benefit) | $ (41) | $ 227 | $ (555)
Deferred federal income tax expense (benefit) | 6 | 3,197 | (94)
Federal income tax expense (benefit), continuing operations | (35) | 3,424 | (649)
Current state and local tax expense (benefit) | 36 | 144 | 120
Deferred state and local income tax expense (benefit) | 0 | 457 | 765
State and local income tax expense (benefit), continuing operations | 36 | 601 | 885
Current foreign tax expense (benefit) | 1,857 | 2,770 | 295
Deferred foreign income tax expense (benefit) | (762) | (1,248) | (118)
Foreign income tax expense (benefit), continuing operations | 1,095 | 1,522 | 177
Current income tax expense (benefit) | 1,852 | 3,141 | (140)
Deferred income tax expense (benefit) | (756) | 2,406 | 553
Income tax expense | $ 1,096 | $ 5,547 | $ 413

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- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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