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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax [Line Items] |  |  |  |  |  |
Corporate tax rate |  |  | 35.00% |  |  |
Re-measurement of deferred tax assets and liabilities | $ 42,400 |  | $ 42,443 |  |  |
Net operating loss carryforward | 334,300 |  | 334,300 |  |  |
Valuation allowance decrease |  |  | 4,500 |  |  |
Deferred tax assets, net | 105,152 |  | 105,152 | $ 225,453 |  |
Unrecognized tax benefits | 3,180 |  | 3,180 | 1,800 | $ 2,717 | $ 5,510
Unrecognized tax benefits, accrued interest and penalties | 500 |  | 500 | 700 |  |
Accounts Payable and Accrued Expenses [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Current taxes payable | 4,200 |  | 4,200 | $ 16,000 |  |
Other Assets [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Current taxes receivable | $ 54,300 |  | $ 54,300 |  |  |
Scenario Forecast [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Corporate tax rate |  | 21.00% |  |  |  |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: 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=84230637&loc=d3e32537-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 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) -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 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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