CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Class A Common Stock	Class A Common Stock Common Stock	Class A Common Stock Retained Earnings	Class B Non-Voting Common Stock Common Stock
Beginning balance (in shares) at Dec. 31, 2019		10,000,000					113,350,267		0
Beginning balance at Dec. 31, 2019	$ 5,623,544	$ 100	$ 2,777,601	$ 2,846,106	$ (1,397)		$ 1,134		$ 0
Increase (Decrease) in Shareholders' Equity
Issuance of common stock upon vesting of restricted stock units and upon exercise of options (in shares)							480,978
Issuance of common stock upon vesting of restricted stock units and upon exercise of options	2,025		2,021				$ 4
Stock-based compensation expense	4,429		4,429
Cash dividends						$ (17,045)		$ (17,045)
Preferred dividends	(3,844)			(3,844)
Change in foreign currency translation adjustment and in fair value of hedged transactions, net of tax	(1,478)				(1,478)
Tax withholding on stock based compensation/ related to vesting of restricted stock units and exercise of stock options (in shares)							(191,334)
Tax withholding on stock based compensation/ related to vesting of restricted stock units and exercise of stock options	(8,413)		(8,411)				$ (2)
Net income	137,151			137,151
Ending balance (in shares) at Mar. 31, 2020		10,000,000					113,639,911		0
Ending balance at Mar. 31, 2020	5,736,369	$ 100	2,775,640	2,962,368	(2,875)		$ 1,136		$ 0
Beginning balance (in shares) at Dec. 31, 2019		10,000,000					113,350,267		0
Beginning balance at Dec. 31, 2019	5,623,544	$ 100	2,777,601	2,846,106	(1,397)		$ 1,134		$ 0
Increase (Decrease) in Shareholders' Equity
Change in foreign currency translation adjustment and in fair value of hedged transactions, net of tax	426
Net income	405,171
Ending balance (in shares) at Sep. 30, 2020		10,000,000					113,778,906		0
Ending balance at Sep. 30, 2020	5,977,323	$ 100	2,788,490	3,188,566	(971)		$ 1,138		$ 0
Beginning balance (in shares) at Mar. 31, 2020		10,000,000					113,639,911		0
Beginning balance at Mar. 31, 2020	5,736,369	$ 100	2,775,640	2,962,368	(2,875)		$ 1,136		$ 0
Increase (Decrease) in Shareholders' Equity
Issuance of common stock upon vesting of restricted stock units and upon exercise of options (in shares)							144,417
Issuance of common stock upon vesting of restricted stock units and upon exercise of options	2,502		2,500				$ 2
Stock-based compensation expense	3,892		3,892
Cash dividends						(17,067)		(17,067)
Preferred dividends	(3,844)			(3,844)
Change in foreign currency translation adjustment and in fair value of hedged transactions, net of tax	524				524
Tax withholding on stock based compensation/ related to vesting of restricted stock units and exercise of stock options (in shares)							(6,605)
Tax withholding on stock based compensation/ related to vesting of restricted stock units and exercise of stock options	(200)		(200)
Net income	147,625			147,625
Ending balance (in shares) at Jun. 30, 2020		10,000,000					113,777,723		0
Ending balance at Jun. 30, 2020	5,869,801	$ 100	2,781,832	3,089,082	(2,351)		$ 1,138		$ 0
Increase (Decrease) in Shareholders' Equity
Issuance of common stock upon vesting of restricted stock units and upon exercise of options (in shares)							1,352
Issuance of common stock upon vesting of restricted stock units and upon exercise of options	28		27				$ 1
Stock-based compensation expense	6,635		6,635
Cash dividends						(17,068)		(17,068)
Preferred dividends	(3,843)			(3,843)
Change in foreign currency translation adjustment and in fair value of hedged transactions, net of tax	1,380				1,380
Tax withholding on stock based compensation/ related to vesting of restricted stock units and exercise of stock options (in shares)							(169)
Tax withholding on stock based compensation/ related to vesting of restricted stock units and exercise of stock options	(5)		(4)				$ (1)
Net income	120,395			120,395
Ending balance (in shares) at Sep. 30, 2020		10,000,000					113,778,906		0
Ending balance at Sep. 30, 2020	5,977,323	$ 100	2,788,490	3,188,566	(971)		$ 1,138		$ 0
Beginning balance (in shares) at Dec. 31, 2020		10,000,000					113,852,896		0
Beginning balance at Dec. 31, 2020	6,072,341	$ 100	2,793,178	3,277,599	325		$ 1,139		$ 0
Increase (Decrease) in Shareholders' Equity
Issuance of preferred stock (in shares)		300,000
Issuance of preferred stock	295,449	$ 3	295,446
Issuance of common stock upon vesting of restricted stock units and upon exercise of options (in shares)							425,232
Issuance of common stock upon vesting of restricted stock units and upon exercise of options	1,441		1,437				$ 4
Stock-based compensation expense	5,408		5,408
Cash dividends						(18,259)		(18,259)
Preferred dividends	(3,844)			(3,844)
Change in foreign currency translation adjustment and in fair value of hedged transactions, net of tax	(1,247)				(1,247)
Tax withholding on stock based compensation/ related to vesting of restricted stock units and exercise of stock options (in shares)							(157,266)
Tax withholding on stock based compensation/ related to vesting of restricted stock units and exercise of stock options	(7,169)		(7,167)				$ (2)
Net income	84,092			84,092
Ending balance (in shares) at Mar. 31, 2021		10,300,000					114,120,862		0
Ending balance at Mar. 31, 2021	6,428,212	$ 103	3,088,302	3,339,588	(922)		$ 1,141		$ 0
Beginning balance (in shares) at Dec. 31, 2020		10,000,000					113,852,896		0
Beginning balance at Dec. 31, 2020	6,072,341	$ 100	2,793,178	3,277,599	325		$ 1,139		$ 0
Increase (Decrease) in Shareholders' Equity
Change in foreign currency translation adjustment and in fair value of hedged transactions, net of tax	(2,060)
Net income	284,851
Ending balance (in shares) at Sep. 30, 2021		10,300,000					113,987,154		0
Ending balance at Sep. 30, 2021	6,583,783	$ 103	3,095,620	3,488,655	(1,735)		$ 1,140		$ 0
Beginning balance (in shares) at Mar. 31, 2021		10,300,000					114,120,862		0
Beginning balance at Mar. 31, 2021	6,428,212	$ 103	3,088,302	3,339,588	(922)		$ 1,141		$ 0
Increase (Decrease) in Shareholders' Equity
Issuance of preferred stock	(19)		(19)
Issuance of common stock upon vesting of restricted stock units and upon exercise of options (in shares)							25,956
Stock-based compensation expense	6,700		6,700
Cash dividends						(18,263)		(18,263)
Preferred dividends	(7,835)			(7,835)
Change in foreign currency translation adjustment and in fair value of hedged transactions, net of tax	(227)				(227)
Tax withholding on stock based compensation/ related to vesting of restricted stock units and exercise of stock options (in shares)							(5,715)
Tax withholding on stock based compensation/ related to vesting of restricted stock units and exercise of stock options	(275)		(275)
Net income	93,422			93,422
Ending balance (in shares) at Jun. 30, 2021		10,300,000					114,141,103		0
Ending balance at Jun. 30, 2021	$ 6,501,715	$ 103	3,094,708	3,406,912	(1,149)		$ 1,141		$ 0
Increase (Decrease) in Shareholders' Equity
Common stock repurchased (in shares)	(153,949)
Common stock repurchased	$ (5,781)		(5,780)				$ (1)
Stock-based compensation expense	6,692		6,692
Cash dividends						$ (18,263)		$ (18,263)
Preferred dividends	(7,331)			(7,331)
Change in foreign currency translation adjustment and in fair value of hedged transactions, net of tax	(586)				(586)
Net income	107,337			107,337
Ending balance (in shares) at Sep. 30, 2021		10,300,000					113,987,154		0
Ending balance at Sep. 30, 2021	$ 6,583,783	$ 103	$ 3,095,620	$ 3,488,655	$ (1,735)		$ 1,140		$ 0