Share-Based Compensation (Details) - $ / shares	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Restricted Stock Units [Member]
Share-Based Compensation [Line Items]
Units granted	483,387	291,500
Weighted-average per share prices	$ 19.14	$ 23.35
Stock Options [Member]
Share-Based Compensation [Line Items]
Stock options awarded	274,000	259,000
Weighted-average exercise prices	$ 16.20	$ 16.07

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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.

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- Definition

Gross number of share options (or share units) granted during the period.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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