Share-Based Compensation - Summary of Weighted-Average Assumptions Used to Value Performance-Share Awards (Details) - Performance Shares [Member] - $ / shares	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.75%	0.82%
Simulation period (years)	2 years 8 months 18 days	2 years 9 months 3 days
Volatility	52.30%	46.58%
Beginning TSR price	$ 16.57	$ 28.09
Forfeiture rate	3.50%	2.20%

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Weighted average expected volatility rate of share-based compensation awards.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

+ Details

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award Fair Value Assumptions Annual Forfeiture Rate

+ References

No definition available.

+ Details

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Performance Shares, Fair Value Assumptions, Beginning TSR Price

+ References

No definition available.

+ Details

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- Details

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