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Restructuring and Acquisition Related Expenses - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Cost and Reserve
Restructuring and acquisition related expenses	$ 4,922	$ 6,923	$ 10,371	$ 30,814
Acquisition-related expenses
Restructuring Cost and Reserve
Restructuring and acquisition related expenses	3,000	3,000	8,000	18,000
Restructuring expenses
Restructuring Cost and Reserve
Restructuring and acquisition related expenses	$ 2,000	$ 4,000	2,000	12,000
Expected future restructuring expense			$ 5,000
Rhiag | Acquisition-related expenses
Restructuring Cost and Reserve
Restructuring and acquisition related expenses				11,000
PGW | Acquisition-related expenses
Restructuring Cost and Reserve
Restructuring and acquisition related expenses				4,000
All 2016 Acquisitions and yet to be Completed Acquisitions Excluding Rhiag and PGW | Acquisition-related expenses
Restructuring Cost and Reserve
Restructuring and acquisition related expenses				$ 3,000

X

- Definition

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations. Additionally, this element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

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- Definition

The quantified amount of the future effect on earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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- Definition

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+ References

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