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Net Loss Per Share
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Net Loss Per Share
Net Loss Per Share
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
$
 
$
 
$
 
$
Net loss attributable to the shareholders of Teekay Corporation - basic and diluted
(12,005
)
 
(12,582
)
 
(60,884
)
 
(137,990
)
Weighted average number of common shares
100,435,045

 
86,261,330

 
99,412,381

 
86,232,315

Common stock and common stock equivalents
100,435,045

 
86,261,330

 
99,412,381

 
86,232,315

Loss per common share - basic and diluted
(0.12
)
 
(0.15
)
 
(0.61
)
 
(1.60
)


The Company intends to settle the principal of the Convertible Notes in cash on conversion and calculates diluted earnings per share using the treasury-stock method. Stock-based awards and the conversion feature on the Convertible Notes that have an anti-dilutive effect on the calculation of diluted loss per common share, are excluded from this calculation. For the three and nine months ended September 30, 2018, options to acquire 3.9 million shares of Teekay Common Stock had an anti-dilutive effect on the calculation of diluted income per common share (three and nine months ended September 30, 2017 - 3.9 million). In periods where a loss attributable to shareholders of Teekay has been incurred, all stock-based awards and the conversion feature on the Convertible Notes are anti-dilutive.