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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
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,
2017
 
2016
 
2015
 
 
(thousands of shares)
 
 
 
 
 
 
 
Issued and outstanding shares – January 1
41,187

 
43,701

 
38,442

 
 
Issuance of shares
—

 
—

 
7,435

 
 
Repurchase of shares
(1,322
)
 
(2,741
)
 
(2,473
)
 
 
Exercise of options and issuance of restricted stock awards
159

 
227

 
297

 
 
Issued and outstanding shares – December 31
40,024

 
41,187

 
43,701