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Share repurchases Share Repurchases (Tables)
 6 Months Ended
Jun. 30, 2020
Treasury Stock, Value [Abstract]  
Class of Treasury Stock [Table Text Block]
The following table summarizes the Company's repurchases of its common stock during the three and six months ended June 30, 2020 and 2019:
 
Three months ended June 30,
 
Six months ended June 30,
 
2020
 
2019
 
2020
 
2019
Open market repurchases:
 
Shares
—

 
2,060

 
4,052

 
2,060

Amount paid
$
—

 
$
112,189

 
$
303,139

 
$
112,189

Average paid per share
$
—

 
$
54.46

 
$
74.81

 
$
54.46