The number of subsidiaries involved in the merger (the "Redomicile Transaction").

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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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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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No definition available.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

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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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No definition available.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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General and Basis of Presentation - Restructuring (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jul. 01, 2016 subsidiary
Restructuring Expenses
Number of subsidiaries involved in Redomicile Transaction \| subsidiary						1
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance			$ 5,383
Restructuring expenses	$ 1,058		5,534	$ 8,243	$ 10,400
Payments			(8,324)
Restructuring Reserve, Ending Balance	2,593		$ 2,593		$ 5,383
Number of reporting units \| item			7
Goodwill impairment loss		$ 194,500		194,500
Loss on disposal and impairment of assets	466	22,307	$ 15,583	26,170
Write-down of assets not in service			7,000
Accrued Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	2,469		2,469
Other Long-Term Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	124		124
North America
Restructuring Reserve [Roll Forward]
Restructuring expenses	942		3,072	3,668
Loss on disposal and impairment of assets	246	479	10,880	4,275
Europe And Africa
Restructuring Reserve [Roll Forward]
Restructuring expenses	116		1,292	831
Restructuring Reserve, Ending Balance	930		930
Loss on disposal and impairment of assets	232	160	4,613	369
Europe And Africa \| Accrued Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	806		806
Europe And Africa \| Other Long-Term Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	124		124
Australia And New Zealand
Restructuring Reserve [Roll Forward]
Loss on disposal and impairment of assets	(12)	21,668	90	21,478
Asset impairment charges		$ 19,000
Corporate Segment
Restructuring Reserve [Roll Forward]
Restructuring expenses			1,170	3,744
Restructuring Reserve, Ending Balance	1,663		1,663
Loss on disposal and impairment of assets				$ 48
Corporate Segment \| Accrued Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	$ 1,663		$ 1,663