Share-Based Compensation - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Stock Award
Unvested restricted stock
Outstanding at the beginning of the period (in shares))	3,885,000
Granted (in shares)	1,130,000
Vested (in shares)	(1,567,000)
Outstanding at the end of the period (in shares)	3,298,000	3,885,000
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 13.41
Granted (in dollars per share)	12.84
Vested (in dollars per share)	14.65
Outstanding at the end of the period (in dollars per share)	$ 12.67	$ 13.41
Total future compensation cost related to unvested awards that are expected to vest	$ 27.6
Weighted Average Period for Cost recognition	2 years
Restricted Stock Award \| Employees and Director
Unvested restricted stock
Granted (in shares)	1,130,304	1,885,440	2,546,801
Restricted Stock Based on Performance Conditions
Unvested restricted stock
Outstanding at the beginning of the period (in shares))	1,595,000
Granted (in shares)	462,000
Vested (in shares)	(644,000)
Outstanding at the end of the period (in shares)	1,413,000	1,595,000
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 12.01
Granted (in dollars per share)	15.31
Vested (in dollars per share)	13.33
Outstanding at the end of the period (in dollars per share)	$ 12.49	$ 12.01
Total future compensation cost related to unvested awards that are expected to vest	$ 4.4
Restricted Stock Based on Performance Conditions \| Executives
Unvested restricted stock
Granted (in shares)	461,919	1,284,829	438,307
Restricted Stock Based on Market Conditions
Unvested restricted stock
Outstanding at the beginning of the period (in shares))	1,690,000
Granted (in shares)	397,692	749,427	544,925
Vested (in shares)	(237,000)
Forfeited (in shares)	(159,000)
Outstanding at the end of the period (in shares)	1,692,000	1,690,000
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 7.94
Granted (in dollars per share)	11.16
Vested (in dollars per share)	11.40
Forfeited (in dollars per share)	11.40
Outstanding at the end of the period (in dollars per share)	$ 7.89	$ 7.94

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ 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)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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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

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-Publisher FASB
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet 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 (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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