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Goodwill and Other Intangible Assets Schedule of Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Goodwill [Line Items]
Goodwill, Gross		$ 1,085,420	$ 1,082,540	$ 1,095,731
Goodwill, Accumulated Impairment Loss		(784,053)	(784,053)	(678,342)
Goodwill		301,367	298,487	417,389
Goodwill, Written off Related to Sale of Business Unit			(7,536)
Goodwill, Translation Adjustments			(5,655)
Goodwill, Period Increase (Decrease)		2,880	(13,191)
Goodwill, Impairment Loss		0
Industrial [Member]
Goodwill [Line Items]
Goodwill, Gross		410,694	408,705	414,298
Goodwill, Accumulated Impairment Loss		137,204	137,204	137,204
Goodwill		273,490	271,501	277,094
Goodwill, Written off Related to Sale of Business Unit			(1,075)
Goodwill, Translation Adjustments			(4,518)
Goodwill, Period Increase (Decrease)		1,989	(5,593)
WIDIA [Member]
Goodwill [Line Items]
Goodwill, Gross		41,515	40,624	41,073
Goodwill, Accumulated Impairment Loss		13,638	13,638	13,638
Goodwill		27,877	26,986	27,435
Goodwill, Written off Related to Sale of Business Unit			0
Goodwill, Translation Adjustments			(449)
Goodwill, Period Increase (Decrease)		891	(449)
Infrastructure [Member]
Goodwill [Line Items]
Goodwill, Gross		633,211	633,211	640,360
Goodwill, Accumulated Impairment Loss		633,211	633,211	527,500
Goodwill		0	0	$ 112,860
Goodwill, Written off Related to Sale of Business Unit			(6,461)
Goodwill, Translation Adjustments			(688)
Goodwill, Period Increase (Decrease)		$ 0	(7,149)
Goodwill, Impairment Loss	$ 105,700		$ (105,711)

X

- Definition

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.

+ References

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-Publisher FASB
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+ References

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