Benefit Plans - Assumptions Used (Details)	12 Months Ended
Dec. 31, 2016 $ / shares
Options 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of options granted (usd per share)	$ 1.94
Weighted-average risk-free interest rate	2.54%
Weighted-average expected option lives (in years)	6 years 6 months
Weighted-average expected volatility	49.00%
Weighted-average expected dividend yield	7.40%
Options 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of options granted (usd per share)	$ 2.19
Weighted-average risk-free interest rate	3.29%
Weighted-average expected option lives (in years)	6 years 8 months 12 days
Weighted-average expected volatility	59.08%
Weighted-average expected dividend yield	6.26%
Options 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of options granted (usd per share)	$ 1.24
Weighted-average risk-free interest rate	1.33%
Weighted-average expected option lives (in years)	3 years 7 months 6 days
Weighted-average expected volatility	59.94%
Weighted-average expected dividend yield	14.40%

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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- Definition

Weighted average expected volatility rate of share-based compensation awards.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of share-based compensation awards, 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 (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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