Summarized Condensed Consolidating Information - Condensed Consolidating Balance Sheets Share Data (Details) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Summarized Condensed Consolidating And Combining Information [Abstract]
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, authorized (shares)	500,000,000	500,000,000
Common stock, issued (shares)	75,478,202	64,816,350
Common stock, outstanding (shares)	75,478,202	64,816,350

Summarized Condensed Consolidating And Combining Information [Abstract]

No definition available.

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- Definition

Face amount or stated value per share of common stock.

+ References

+ Details

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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