Condensed Consolidated Statements of Stockholders’ Equity (Unaudited) - USD ($) $ in Thousands	Total	Treasury Stock	Add’l Paid in Capital	Accumulated Comprehensive Income	Accumulated Deficit	Series AA PREF Stock Preferred Stock	Class A CMN Stock Common Stock	Class B CMN Stock Common Stock
Beginning balance at Dec. 31, 2020	$ 1,202,768	$ (44,786)	$ 1,963,850	$ 934	$ (717,331)	$ 0	$ 87	$ 14
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation	1,060		1,060
Issuance of common stock through stock awards	13,376		13,376
Exercise of stock options	5,224		5,224
Issuance of common stock through employee purchase plan	2,172		2,172
Purchase of treasury stock	(5,717)	(5,717)
Foreign currency translation	204			204
Net income	38,329				38,329
Dividends/distributions to common shareholders	(75,818)				(75,818)
Dividends, preferred stock	(91)				(91)
Ending balance at Mar. 31, 2021	1,181,507	(50,503)	1,985,682	1,138	(754,911)	0	87	14
Beginning balance at Dec. 31, 2020	1,202,768	(44,786)	1,963,850	934	(717,331)	0	87	14
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation	504
Net income	157,938
Ending balance at Jun. 30, 2021	1,231,605	(50,503)	1,991,836	1,438	(711,267)	0	87	14
Beginning balance at Mar. 31, 2021	1,181,507	(50,503)	1,985,682	1,138	(754,911)	0	87	14
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation	917		917
Issuance of common stock through stock awards	594		594
Exercise of stock options	2,575		2,575
Issuance of common stock through employee purchase plan	2,068		2,068
Foreign currency translation	300			300
Net income	119,609				119,609
Dividends/distributions to common shareholders	(75,874)				(75,874)
Dividends, preferred stock	(91)				(91)
Ending balance at Jun. 30, 2021	1,231,605	(50,503)	1,991,836	1,438	(711,267)	0	87	14
Beginning balance at Dec. 31, 2021	1,217,089	(50,852)	2,001,399	855	(734,415)	0	88	14
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation	1,405		1,405
Issuance of common stock through stock awards	30,145		30,145
Exercise of stock options	1,307		1,307
Issuance of common stock through employee purchase plan	3,589		3,589
Purchase of treasury stock	(10,446)	(10,446)
Foreign currency translation	314			314
Net income	92,151				92,151
Dividends/distributions to common shareholders	(111,602)				(111,602)
Dividends, preferred stock	(91)				(91)
Ending balance at Mar. 31, 2022	1,223,861	(61,298)	2,037,845	1,169	(753,957)	0	88	14
Beginning balance at Dec. 31, 2021	1,217,089	(50,852)	2,001,399	855	(734,415)	0	88	14
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation	(369)
Net income	226,356
Ending balance at Jun. 30, 2022	1,240,066	(61,298)	2,042,427	486	(741,651)	0	88	14
Beginning balance at Mar. 31, 2022	1,223,861	(61,298)	2,037,845	1,169	(753,957)	0	88	14
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation	1,356		1,356
Issuance of common stock through stock awards	221		221
Exercise of stock options	599		599
Issuance of common stock through employee purchase plan	2,406		2,406
Foreign currency translation	(683)			(683)
Net income	134,205				134,205
Dividends/distributions to common shareholders	(121,808)				(121,808)
Dividends, preferred stock	(91)				(91)
Ending balance at Jun. 30, 2022	$ 1,240,066	$ (61,298)	$ 2,042,427	$ 486	$ (741,651)	$ 0	$ 88	$ 14