Earnings per Share Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]

Schedule of Weighted Average Number of Shares [Table Text Block]

The following table summarizes the dilutive effect of restricted shares and options to purchase common stock for the three months ended March 31, 2017 and 2016:

	Three months ended March 31,
	2017	2016
Weighted average common shares—basic	45,570,495	45,278,990
Dilutive effect of restricted share awards	283,839	286,189
Dilutive effect of stock options	54,624	89,637
Weighted average common shares—diluted	45,908,958	45,654,816