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Subsequent Events	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsOn April 13, 2018, Carl C. Icahn and certain affiliated entities (together, “Icahn”) delivered to the Company formal notice of its intention to nominate five directors for election to the Board at the Annual Meeting, and on April 24, 2018, Icahn filed a preliminary proxy statement to that effect. As a result of the contested election, we expect to incur significant costs during 2018, including a fee of approximately $4.0 million that will be paid to our strategic adviser in the second quarter of 2018, as well as other ancillary costs throughout the process.

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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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