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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Goodwill, Written off Related to Sale of Business Unit			$ 7,536
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, Translation Adjustments			(5,655)
Goodwill, Period Increase (Decrease)		2,880	(13,191)
Goodwill, Impairment Loss		0
Industrial [Member]
Goodwill, Written off Related to Sale of Business Unit			1,075
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, Translation Adjustments			(4,518)
Goodwill, Period Increase (Decrease)		1,989	(5,593)
Infrastructure [Member]
Goodwill, Written off Related to Sale of Business Unit			6,461
Goodwill and Intangible Asset Impairment	$ 106,100
Goodwill, Gross		633,211	633,211	640,360
Goodwill, Accumulated Impairment Loss		(633,211)	(633,211)	(527,500)
Goodwill		0	0	112,860
Goodwill, Translation Adjustments			(688)
Goodwill, Period Increase (Decrease)		$ 0	(7,149)
Goodwill, Impairment Loss	(105,700)		$ 105,711
March Charges [Member] | Infrastructure [Member]
Goodwill and Intangible Asset Impairment				152,900
Goodwill, Impairment Loss				(152,500)
December Charges [Member] | Infrastructure [Member]
Goodwill and Intangible Asset Impairment				376,500
Goodwill, Impairment Loss				(375,000)
Trademarks [Member] | Industrial [Member]
Impairment of Intangible Assets (Excluding Goodwill)	2,300
Trademarks [Member] | Infrastructure [Member]
Impairment of Intangible Assets (Excluding Goodwill)	$ 400
Trademarks [Member] | March Charges [Member] | Infrastructure [Member]
Impairment of Intangible Assets (Excluding Goodwill)				400
Trademarks [Member] | Charge Associated with Finalization [Member] | Infrastructure [Member]
Impairment of Intangible Assets (Excluding Goodwill)				6,800
Trademarks [Member] | December Charges [Member] | Infrastructure [Member]
Impairment of Intangible Assets (Excluding Goodwill)				$ 1,500

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
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