Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Change in Accounting Estimate [Line Items]
Income tax expense (benefit)	$ (2,760)	$ (38,660)	$ (18,471)	$ (69,098)
Effective income tax rate, percent			(37.60%)	(49.08%)
Federal Statutory income tax rate, percent			21.00%	35.00%
Tax Adjustments, Settlements, and Unusual Provisions			$ 21,000
Total provision for income tax expense (benefit)					$ 20,200
Industry Issue Resolution
Change in Accounting Estimate [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions			5,000
U.S. Tax Cut and Jobs Act of 2017
Change in Accounting Estimate [Line Items]
Total provision for income tax expense (benefit)			$ 200