Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Sep. 30, 2018	Mar. 31, 2018
Goodwill [Roll Forward]
Balance at April 1, 2018	$ 347,434	$ 347,434
Currency translation		(12,198)
Balance at September 30, 2018		329,062
Gross Carrying Amount		291,540	$ 304,628
Accumulated Amortization		(46,612)	(40,864)
Net		244,928	263,764
Indefinite-Lived Trademarks		47,639	48,874
Trademark
Goodwill [Roll Forward]
Gross Carrying Amount		6,407	5,875
Accumulated Amortization		(4,123)	(3,299)
Net		2,284	2,576
Indefinite-lived Intangible Assets [Member]
Goodwill [Roll Forward]
Accumulated Amortization		0	0
Customer relationships
Goodwill [Roll Forward]
Gross Carrying Amount		187,098	199,045
Accumulated Amortization		(30,972)	(27,887)
Net		156,126	171,158
Unpatented Technology [Member]
Goodwill [Roll Forward]
Gross Carrying Amount		46,811	46,898
Accumulated Amortization		(8,971)	(7,436)
Net		37,840	39,462
Other
Goodwill [Roll Forward]
Gross Carrying Amount		3,585	3,936
Accumulated Amortization		(2,546)	(2,242)
Net		1,039	$ 1,694
Goodwill [Member]
Finite-Lived Intangible Assets [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment	$ (6,174)	$ (6,174)

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit.

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