Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance, shares at Dec. 31, 2022		12,756,885
Common stock repurchased, shares	(33,035)	(33,035)
Restricted stock units converted to common stock, shares		100,757
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		12,300
Balance, shares at Mar. 31, 2023		12,836,907
Balance at Dec. 31, 2022	$ 1,624,000,000	$ 100,000	$ 245,700,000	$ 1,381,100,000	$ (2,900,000)
Net income	99,500,000	0	0	99,500,000	0
Other comprehensive loss	800,000	0	0	0	800,000
Stock-based compensation	9,900,000	0	9,900,000	0	0
Common stock repurchased, value	(14,900,000)	0	(7,600,000)	(7,300,000)	0
Stock Issued During Period, Value, Stock Options Exercised	4,100,000		4,100,000
Balance at Mar. 31, 2023	$ 1,723,400,000	$ 100,000	252,100,000	1,473,300,000	(2,100,000)
Balance, shares at Dec. 31, 2023	12,522,397	12,522,397
Common stock repurchased, shares	(351,368)	(351,368)
Restricted stock units converted to common stock, shares		7,125
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		42,426
Balance, shares at Mar. 31, 2024	12,220,580	12,220,580
Balance at Dec. 31, 2023	$ 1,753,700,000	$ 100,000	279,000,000.0	1,475,600,000	(1,000,000.0)
Net income	64,300,000	0	0	64,300,000	0
Other comprehensive loss	(200,000)	0	0	0	(200,000)
Stock-based compensation	10,900,000	0	10,900,000	0	0
Common stock repurchased, value	(191,100,000)	0	(1,000,000.0)	(190,100,000)	0
Stock Issued During Period, Value, Stock Options Exercised	14,600,000		14,600,000
Balance at Mar. 31, 2024	$ 1,652,200,000	$ 100,000	$ 303,500,000	$ 1,349,800,000	$ (1,200,000)