Earnings Per Share Potential Shares Excluded from Diluted Earnings Per Share Calculation (Tables)

12 Months Ended

Dec. 31, 2015

Potential Shares Excluded from Diluted Earnings Per Share Calculation [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following table presents the potential shares excluded from the diluted earnings per share calculation because the effect of including these potential shares would be antidilutive.

	Years ended December 31,
	2015	2014	2013
Preferred Stock Outstanding 1	0.0	0.0	13.7
Securities excluded from the diluted earnings per share calculation because the exercise price was greater than the average market price:
Stock options 2	0.0	0.0	0.1

1 We converted all of our 5 1/4% Series B Cumulative Convertible Perpetual Preferred Stock into common stock in October 2013. For purposes of calculating diluted earnings per share for 2013, the potentially dilutive shares would have been pro-rated based on the period they were outstanding but were antidilutive.

2 These options were outstanding at the end of the respective periods. In any period in which the exercise price is less than the average market price, these options have the potential to be dilutive, and application of the treasury stock method would reduce this amount.