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Stock Incentive Plans - Stock Awards Activity (Details)	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Weighted- Average Grant Date Fair Value
Stock of common stock earned for the PSUs vested in 2018	51.75%
Restricted Stock
Number of Shares
Beginning Balance (in shares) | shares	630,962
Granted (in shares) | shares	349,091
Vested (in shares) | shares	(338,209)
Ending Balance (in shares) | shares	641,844
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 10.66
Granted (in dollars per share) | $ / shares	10.19
Vested (in dollars per share) | $ / shares	10.94
Ending balance (in dollars per share) | $ / shares	$ 10.25
Performance Stock Units
Number of Shares
Beginning Balance (in shares) | shares	785,797
Granted (in shares) | shares	293,111
Additional units from dividends (in shares) | shares	18,260
Vested (in shares) | shares	(218,514)
Ending Balance (in shares) | shares	878,654
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 10.42
Granted (in dollars per share) | $ / shares	9.82
Additional units from dividends (in dollars per share) | $ / shares	11.13
Vested (in dollars per share) | $ / shares	11.98
Ending balance (in dollars per share) | $ / shares	$ 9.85

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional units from dividends

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional units from dividends, Weighted Average Grant Date Fair Value

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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
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&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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-Topic 718
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-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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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
-Name Accounting Standards Codification
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-Paragraph 2
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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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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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Percentage of vesting of share-based compensation awards.

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