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Capital Stock (Tables)
12 Months Ended
Dec. 31, 2019
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]  
Common Shares Outstanding and Treasury Shares Held Rollforward Table
Common Shares Outstanding
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
At beginning of period
 
125,737,565

 
115,877,704

 
114,985,072

Exercise of common stock options, net
 

 
65,524

 

Grants of restricted stock, net (1)
 
(256,402
)
 
2,022,316

 
892,632

Issuance of common stock
 

 
7,772,021

 

At end of period
 
125,481,163

 
125,737,565

 
115,877,704

 
(1) 
Prior to 2019, we primarily granted restricted stock awards, which immediately impact common shares outstanding. In contrast, during 2019, we primarily granted restricted stock units that will not impact common shares outstanding until vesting, which will begin in 2020.

Treasury Shares Held
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
At beginning of period
 
2,717,569

 
2,638,093

 
2,536,421

Shares received upon vesting of restricted stock, net
 
105,622

 
79,476

 
101,672

At end of period
 
2,823,191

 
2,717,569

 
2,638,093