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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Stockholders' Equity Note [Abstract]  
Rollforward of Common Stock Issued and Outstanding The following table is a summary of changes in common shares issued and outstanding:
 
 
 
 
 
 
 
 
 
Year ended December 31,
2019
 
2018
 
2017
 
 
(thousands of shares)
 
 
 
 
 
 
 
Issued and outstanding shares – January 1
42,207

 
40,024

 
41,187

 
 
Issuance of shares
1,739

 
1,947

 
—

 
 
Repurchase of shares
—

 
—

 
(1,322
)
 
 
Exercise of options and issuance of restricted stock awards
202

 
236

 
159

 
 
Issued and outstanding shares – December 31
44,148

 
42,207

 
40,024