Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Series AA Preferred Stock	Common Stock Common Class A	Common Stock Common Class B	Treasury Stock	Additional Paid-In Capital	Accumulated Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2019	$ 1,180,306	$ 0	$ 87	$ 14	$ (34,294)	$ 1,922,222	$ 685	$ (708,408)
Increase (Decrease) in Stockholders' Equity
Non-cash compensation	4,669					4,669
Issuance of common stock through stock awards	25,811					25,811
Exercise of stock options	3,138					3,138
Issuance of common stock through employee purchase plan	8,010					8,010
Purchase of treasury stock	(10,492)				(10,492)
Foreign currency translation	249						249
Net income	243,386							243,386
Dividends/distributions to common shareholders	(251,944)							(251,944)
Dividends, preferred stock	(365)							(365)
Ending balance at Dec. 31, 2020	1,202,768	0	87	14	(44,786)	1,963,850	934	(717,331)
Increase (Decrease) in Stockholders' Equity
Non-cash compensation	4,942					4,942
Issuance of common stock through stock awards	13,566		1			13,565
Exercise of stock options	10,170					10,170
Issuance of common stock through employee purchase plan	8,872					8,872
Purchase of treasury stock	(6,066)				(6,066)
Foreign currency translation	(79)						(79)
Net income	388,090							388,090
Dividends/distributions to common shareholders	(404,809)							(404,809)
Dividends, preferred stock	(365)							(365)
Ending balance at Dec. 31, 2021	1,217,089	0	88	14	(50,852)	2,001,399	855	(734,415)
Increase (Decrease) in Stockholders' Equity
Non-cash compensation	11,012					11,012
Issuance of common stock through stock awards	30,366					30,366
Exercise of stock options	8,671					8,671
Issuance of common stock through employee purchase plan	10,223					10,223
Purchase of treasury stock	(10,506)				(10,506)
Foreign currency translation	(1,514)						(1,514)
Net income	438,647							438,647
Dividends/distributions to common shareholders	(508,249)							(508,249)
Dividends, preferred stock	(365)							(365)
Ending balance at Dec. 31, 2022	$ 1,195,374	$ 0	$ 88	$ 14	$ (61,358)	$ 2,061,671	$ (659)	$ (804,382)