Earnings per Share Earnings per Share (Tables)

6 Months Ended

Jun. 30, 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 RSUs and options to purchase common stock for the six months ended June 30, 2019 and 2018:

	Three months ended June 30,		Six months ended June 30,
	2019	2018	2019	2018
Weighted average common shares—basic	45,592,075	45,920,307	45,585,445	45,850,137
Dilutive effect of restricted stock units	174,571	176,658	253,796	267,620
Dilutive effect of stock options	61,669	103,792	71,008	97,290
Weighted average common shares—diluted	45,828,315	46,200,757	45,910,249	46,215,047

In February 2019, the Company announced its Board of Directors had authorized the Company to increase the purchase of its common stock up to $75 million in the aggregate.  The previous authorization, approved in November 2015, authorized up to $50 million in share repurchases. In the three and six months ended June 30, 2019, the Company purchased 502,500 and 527,400 shares of its outstanding common stock for approximately $14.7 million and $15.4 million, respectively. During the the three and six months ended June 30, 2018, the Company purchased 100,947 shares of its outstanding common stock for approximately $2.9 million.