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Income Taxes (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Other | $ 379,000 | $ 0 |
Income Taxes (Textual) [Abstract] |  |  |
U.S. federal statutory corporate tax rate | 35.00% | 35.00% | 35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | 21.00% |  |
deferred tax effect - tax cut job act benefit | $ (73,028,000) | $ 0 | $ 0
Deferred Income Tax Expense (Benefit) | (46,063,000) | 14,162,000 | 11,884,000
Provision for income taxes | $ 5,561,000 | $ 80,306,000 | $ 88,172,000
Effective tax rate | 2.50% | 35.30% | 48.40%
number of foreign subsidiaries | 2 |  |
Deferred Tax Liabilities, Net | $ 15,000,000 |  |
Deferred Tax Liabilities, Net, Noncurrent | 124,404,000 | $ 161,502,000 |
No unrecognized tax benefits | 1,000,000.0 | $ 0 |
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 800,000 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 200,000 |  |
U.S. |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses |  |  | $ 0
Foreign [Member] |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Operating Loss Carryforwards | 122,000,000 |  |
State [Member] |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Operating Loss Carryforwards | $ 261,900,000 |  |
Minimum [Member] |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Operating Loss Carryforwards, Expiration Dates | Dec. 31, 2018 |  |
Maximum [Member] |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Operating Loss Carryforwards, Expiration Dates | Dec. 31, 2037 |  |

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- Definition Amount of deferred income 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=63044130 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 4: 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 5: 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 + Details
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