Consolidated Statements of Changes In Shareholders' Equity (Deficit) (Parenthetical) - $ / shares  | 
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015  | 
Dec. 31, 2014  | 
Dec. 31, 2013  | 
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| Common Stock, Regular | |||
| Paid cash dividends, per share | $ 0 | $ 0.40 | $ 0.36 | 
| Common Stock, Special | |||
| Paid cash dividends, per share | $ 0.42 | ||
| X | ||||||||||
- Definition Aggregate dividends paid during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
- Details 
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| X | ||||||||||
- Details 
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