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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Basic And Diluted Earnings Per Share



	Year ended December 31,
	2020			2019			2018
Net income	$	355,766		$	350,158		$	176,553
Shares:
Weighted-average number of common shares outstanding (for basic calculation)		27,917			27,740			27,823
Dilutive stock awards		499			555			139
Weighted-average number of common shares outstanding (for diluted calculation)		28,416			28,295			27,962
Basic earnings per share	$	12.74		$	12.62		$	6.35
Diluted earnings per share	$	12.52		$	12.38		$	6.31

Stock Awards Excluded From The Calculation Of Diluted EPS



	Year ended December 31,
	2020			2019			2018
Stock awards subject to performance conditions		87			81			95
Stock awards that were antidilutive		57			139			1,741
Total stock awards excluded from diluted earnings per share		144			220			1,836