Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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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 reported income tax expense (benefit) attributable to the repeal of the Alternative Minimum Tax by the Tax Cuts and Jobs Act of 2017.

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Amount of income tax expense (benefit) primarily due to the intangible asset impairment charge.

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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income taxes disclosures
U.S. federal statutory rate (as a percent)				21.00%		35.00%
Income tax benefit related to the alternative minimum tax credits		$ 1,600
Tax benefit due to intangible asset impairment charge		25,300
Asset impairment charges		$ 252,300	$ 2	$ 252,343	$ 1,139
Loss before income taxes	$ (8,652)		(26,206)	(290,368)	(69,252)
Income tax expense (benefit)	$ 301		(2,466)	(27,954)	(26,334)
Federal
Income taxes disclosures
Income tax expense (benefit)			(2,800)	(1,100)	(22,700)
Foreign tax
Income taxes disclosures
Income tax expense (benefit)			$ 300	$ (26,900)	$ (3,600)