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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share

Year ended December 31,

2019

2018

2017

Net income

$

350,158

$

176,553

$

176,253

Shares:

Weighted-average number of common shares outstanding (for basic calculation)

27,740

27,823

28,491

Dilutive stock awards

555

139

70

Weighted-average number of common shares outstanding (for diluted calculation)

28,295

27,962

28,561

Basic earnings per share

$

12.62

$

6.35

$

6.19

Diluted earnings per share

$

12.38

$

6.31

$

6.17
Stock Awards Excluded from the Calculation of Diluted EPS

Year ended December 31,

2019

2018

2017

Stock awards subject to performance conditions

81

95

217

Stock awards that were antidilutive

139

1,741

1,695

Total stock awards excluded from diluted earnings per share

220

1,836

1,912