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Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Unless disclosed elsewhere within the notes to the Condensed Consolidated Financial Statements, the following are the significant matters that occurred subsequent to June 30, 2017. Dividends On August 7, 2017, the Company's Board of Directors declared a quarterly dividend of $0.25 per share of common stock, which is payable on September 7, 2017 to stockholders of record at the close of business on August 21, 2017.  RCM3, LLC On July 28, 2017, the Company, through a subsidiary, purchased a 0.1% membership interest in RCM3, LLC ("RCM3"), which owns a single RC project that produces RC that qualifies for Section 45 tax credits, from Tinuum Group for an up-front payment of $0.1 million. Tinuum Group, NexGen and an independent third party own the remaining 49.9%, 0.1% and 49.9%, respectively, of RCM3. The Company is currently evaluating the accounting treatment for this purchase and expects to account for RCM3 as an equity method investment.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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