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Stock Incentive Plans (Details)
12 Months Ended
Dec. 31, 2016
2015-2017 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Risk free rates minimum 0.16%
Risk free rates maximum 1.16%
Expected volatility rate, minimum 13.64% [1]
Expected volatility rate, maximum 42.75% [1]
Dividend yield 4.818%
Historical volatility 50.00%
Implied volatility 50.00%
2016-2018 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Risk free rates minimum 0.40%
Risk free rates maximum 1.07%
Expected volatility rate, minimum 15.75% [1]
Expected volatility rate, maximum 38.61% [1]
Dividend yield 5.039%
Historical volatility 50.00%
Implied volatility 50.00%
[1]
Figures use 50% historical and 50% implied volatility.