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Employee Benefit Plans - Schedule Of Restricted Stock And Restricted Stock Units Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 31, 2015
Shares
Awards outstanding at beginning of year (in shares)	661,124	554,960	771,942
Granted (in shares)	1,298,121	501,076	139,455
Vested (in shares)	(305,588)	(332,223)	(356,437)
Forfeited (in shares)	(75,684)	(62,689)	0
Awards outstanding at end of year (in shares)	1,577,973	661,124	554,960
Grant Date Fair Value
Awards outstanding at beginning of year (in dollars per share)	$ 16.28	$ 17.54	$ 13.62
Granted (in dollars per share)	5.70	15.57	23.22
Vested (in dollars per share)	16.94	16.44	11.27
Forfeited (in dollars per share)	7.76	20.93	0.00
Awards outstanding at end of year (in dollars per share)	$ 7.86	$ 16.28	$ 17.54
Fair value of awards vested	$ 2.2	$ 5.1	$ 8.2
Restricted Stock Units (RSUs) [Member]
Shares
Awards outstanding at beginning of year (in shares)		33,760
Awards outstanding at end of year (in shares)			33,760
Grant Date Fair Value
Awards outstanding at beginning of year (in dollars per share)		$ 15.80
Awards outstanding at end of year (in dollars per share)			$ 15.80
Long-term incentive cash awards paid				$ 0.7

X

- Definition

The amount of distributions made to the individual during the period.

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- Definition

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=6415400&loc=d3e5070-113901

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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.

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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (c)(2)(iii)(3)
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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).

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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

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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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.

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

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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