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STOCKHOLDERS' EQUITY
 9 Months Ended
Sep. 30, 2020
Stockholders' Equity Note [Abstract]  
STOCKHOLDERS' EQUITY STOCKHOLDERS’ EQUITY
A summary of changes in stockholders’ equity is presented below (in thousands): 
 Nine Months Ended September 30, 2020
 (In thousands)
 Number of
Shares		Common
Stock		Additional
Paid-In
Capital		Retained
Earnings		Total
Balance at December 31, 201938,199 $382 $505,352 $1,468,256 $1,973,990 
Net earnings— — — 71,152 71,152 
Stock-based compensation expense— — 6,437 — 6,437 
Issuance of stock398 4 (4)— — 
Share repurchases(1,000)(10)(60,803)— (60,813)
Balance at March 31, 202037,597 $376 $450,982 $1,539,408 $1,990,766 
Net earnings— — — 90,678 90,678 
Stock-based compensation expense— — 3,157 — 3,157 
Issuance of stock6 1 (1)— — 
Balance at June 30, 202037,603 377 454,138 1,630,086 2,084,601 
Net earnings— — — 109,118 109,118 
Stock-based compensation expense— — 6,130 — 6,130 
Issuance of stock9 — — — — 
Balance at September 30, 202037,612 $377 $460,268 $1,739,204 $2,199,849 
 Nine Months Ended September 30, 2019
 (In thousands)
 Number of
Shares		Common
Stock		Additional
Paid-In
Capital		Retained
Earnings		Total
Balance at December 31, 201838,073 $381 $501,781 $1,218,593 $1,720,755 
Net earnings— — — 25,412 25,412 
Stock-based compensation expense— — 5,861 — 5,861 
Issuance of stock400 4 (4)— — 
Share repurchases(209)(2)(8,955)— (8,957)
Balance at March 31, 201938,264 $383 $498,683 $1,244,005 $1,743,071 
Net earnings— — — 50,828 50,828 
Stock-based compensation expense— — 4,201 — 4,201 
Issuance of stock3 — — — — 
Balance at June 30, 201938,267 383 502,884 1,294,833 1,798,100 
Net earnings— — — 69,809 69,809 
Stock-based compensation expense— — 5,657 — 5,657 
Issuance of stock32 — — — — 
Balance at September 30, 201938,299 $383 $508,541 $1,364,642 $1,873,566