Stock-Based Compensation - Performance Shares and Restricted Stock Units - Additional Information (Details) - $ / shares	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted	883,296	884,202
Weighted average estimated fair value of share granted	$ 10.87	$ 14.27
Number of performance periods	3 years	3 years
Vesting period description	The 2016 and 2015 grants are generally divided evenly over three annual performance periods commencing with calendar year 2016 and 2015, respectively, and will vest on the first, second and third anniversary of the grant date.
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted	2,954,387	2,693,878
Weighted average estimated fair value of share granted	$ 10.86	$ 13.82
Restricted Stock Units (RSUs) \| Non Employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted	0	0

Number of performance periods.

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- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

+ 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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).

+ 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 (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).

+ 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 (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

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