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Share and Incentive-Based Compensation - Awards Activity (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Number of Shares/Units
Unvested shares/units outstanding at end of period	400
Number of Units
Unvested performance units outstanding at December 31, 2017	49
Granted (units)	0
Vested (units)	(48)
Forfeited / Canceled (units)	(1)
Unvested performance units outstanding at September 30, 2018	0
Fair Value per Unit at September 30, 2018
Employee Incentive Plan, Performance Units, Fair Value | $ / shares	$ 0
Restricted Stock
Number of Shares/Units
Unvested shares/units outstanding at beginning of period	1,105
Granted (in shares/units)	366
Vested (in shares/units)	(1,049)
Forfeited / Canceled (in shares/units)	(39)
Unvested shares/units outstanding at end of period	383
Fair Value (usd per share/unit)
Unvested shares/units outstanding at beginning of period (in usd per share/unit) | $ / shares	$ 22.62
Granted (in usd per share/unit) | $ / shares	16.06
Vested (in usd per share/unit) | $ / shares	22.71
Forfeited / Canceled (in usd per share/unit) | $ / shares	21.61
Unvested shares/units outstanding at end of period (in usd per share/unit) | $ / shares	$ 16.22
Performance Share Units
Number of Shares/Units
Unvested shares/units outstanding at beginning of period	183
Granted (in shares/units)	111
Vested (in shares/units)	(177)
Forfeited / Canceled (in shares/units)	(6)
Unvested shares/units outstanding at end of period	111
Fair Value (usd per share/unit)
Unvested shares/units outstanding at end of period (in usd per share/unit) | $ / shares	$ 20.41

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Employee Incentive Plan, Performance Units, Nonvested, Number of Shares [Roll Forward]

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Employee Incentive Plan, Performance Units, Nonvested, Weighted Average Fair Value [Abstract]

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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
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

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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).

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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).

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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.

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-Publisher FASB
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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.

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-Publisher FASB
-Name Accounting Standards Codification
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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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