Restructuring Charges (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve
Restructuring Reserve, Beginning	$ 10,620	$ 9,531
Restructuring Charges	18,420	12,772	$ 6,235
Payments for Restructuring	(20,820)	(12,663)
Restructuring Reserve, Translation Adjustment	(248)	980
Restructuring Reserve, Ending	$ 7,972	$ 10,620	$ 9,531

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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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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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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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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Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

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