Earnings per Share Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2018

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:

	Year ended December 31,
	2018	2017	2016
Weighted average common shares—basic	45,824,555	45,682,627	45,407,316
Dilutive effect of restricted share awards	242,204	241,974	—
Dilutive effect of stock options	103,705	65,651	—
Weighted average common shares—diluted	46,170,464	45,990,252	45,407,316

In November 2015, the Company announced its Board of Directors had authorized the Company to purchase up to $50 million in the aggregate of its common stock.  During 2018, the Company purchased 442,632 shares of its outstanding common stock for approximately $12.1 million. The Company did not purchase any shares of its outstanding common stock during 2017 or 2016.