Earnings per Share Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2019

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,
	2019	2018	2017
Weighted average common shares—basic	45,303,659	45,824,555	45,682,627
Dilutive effect of restricted share awards	224,946	242,204	241,974
Dilutive effect of stock options	66,549	103,705	65,651
Weighted average common shares—diluted	45,595,154	46,170,464	45,990,252

In November 2019, the Company announced that its Board of Directors increased the Company's common stock share repurchase authorization to $150 million. The initial authorization, approved in November 2015, authorized up to $50 million in the aggregate of its common stock.  During 2019 and 2018, the Company purchased 1,230,050 and 442,632 shares of its outstanding common stock for approximately $36.7 million and $12.1 million, respectively. The Company did not purchase any shares of its outstanding common stock during 2017.