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Stock Incentive Plans - Performance Stock Units (Details) - Performance Stock Units - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares, Beginning Balance	686,684	676,359	436,170
Number of shares, Granted	266,009	310,398	218,467
Number of shares, Additional units from dividends	33,478	38,324	21,722
Number of shares, Vested	(200,374)	(242,096)
Number of shares, Forfeited		(96,301)
Number of shares, Ending Balance	785,797	686,684	676,359
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average grant date fair value, Beginning balance (in dollars per share)	$ 10.65	$ 11.41	$ 10.95
Weighted-average grant date fair value, Granted (in dollars per share)	11.04	8.54	12.13
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share)	11.17	9.37	13.51
Weighted-average grant date fair value, Vested (in dollars per share)	12.15	9.85
Weighted-average grant date fair value, Forfeited (in dollars per share)		10.74
Weighted-average grant date fair value, Ending balance (in dollars per share)	$ 10.42	$ 10.65	$ 11.41
Stock of common stock earned for the PSUs vested in 2016 (as a percent)	51.80%	89.50%
Percentage of total stockholder return for payout of shares (as a percent)	30.00%
Share based payment, vesting period (years)tion Arrangement by Share-based Payment Award, Award Vesting Period	3 years

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Percentage of Total Stockholder Return For Payout of Shares

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Additional Shares From Dividend Weighted Average Grant Date Fair Value.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Additional Shares From Dividends Number.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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-Publisher FASB
-Name Accounting Standards Codification
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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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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 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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