Summary of Signficant Accounting Policies (Details Textual 1) - USD ($) $ in Thousands, shares in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements		1.2	0.8
Conditions for Investments in Entities Accounted for Equity Basis		0.50
Goodwill		$ 301,802	$ 301,367	$ 298,487
Finite-Lived Intangible Assets, Accumulated Amortization		145,334	129,981
Intangible Assets, Gross (Excluding Goodwill)		321,802	$ 320,508
Goodwill and Intangible Asset Impairment		$ 0
Conditions for Investments in Entities Accounted for on Cost Basis		0.50
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		0.4	1.4
Contractual Rights [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross		$ 7,061	$ 7,064
Finite-Lived Intangible Assets, Accumulated Amortization		$ 7,036	7,014
Finite-lived Intangible Assets, Written off Related to Sale of Business Unit				500
Contractual Rights [Member] | Maximum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		15 years
Contractual Rights [Member] | Minimum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		3 years
Technology-Based and other [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross		$ 46,666	46,461
Finite-Lived Intangible Assets, Accumulated Amortization		$ 30,923	29,061
Finite-lived Intangible Assets, Written off Related to Sale of Business Unit				800
Technology-Based and other [Member] | Maximum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		20 years
Technology-Based and other [Member] | Minimum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		4 years
Customer-related [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross		$ 206,162	205,502
Finite-Lived Intangible Assets, Accumulated Amortization		$ 85,301	74,669
Finite-lived Intangible Assets, Written off Related to Sale of Business Unit				30,000
Customer-related [Member] | Maximum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		21 years
Customer-related [Member] | Minimum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years
Unpatented Technology [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross		$ 31,854	31,754
Finite-Lived Intangible Assets, Accumulated Amortization		$ 13,096	10,589
Finite-lived Intangible Assets, Written off Related to Sale of Business Unit				15,400
Unpatented Technology [Member] | Maximum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		30 years
Unpatented Technology [Member] | Minimum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years
Trademarks [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross		$ 12,450	12,401
Finite-Lived Intangible Assets, Accumulated Amortization		$ 8,978	8,648
Finite-lived Intangible Assets, Written off Related to Sale of Business Unit				1,100
Trademarks [Member] | Maximum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		20 years
Trademarks [Member] | Minimum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		5 years
Trademarks [Member]
Business Acquisition [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)		$ 17,609	17,326
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit				5,000
Infrastructure [Member]
Business Acquisition [Line Items]
Goodwill		0	0	0
Goodwill, Written off Related to Sale of Business Unit				(6,500)
Goodwill and Intangible Asset Impairment	$ 106,100
Goodwill, Impairment Loss	105,700
Infrastructure [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	400
Industrial [Member]
Business Acquisition [Line Items]
Goodwill		$ 274,254	$ 273,490	271,501
Goodwill, Written off Related to Sale of Business Unit				$ (1,100)
Industrial [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	$ 2,300