CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Class A Common Stock Common Stock	Preferred Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Total
Balance at Dec. 31, 2018	$ 1,110		$ 2,474,238	$ 2,331,552		$ 4,806,900
Balance (in shares) at Dec. 31, 2018	110,949,850
Increase (Decrease) in Shareholders' Equity
Issuance of common stock upon vesting of restricted stock units and upon exercise of options	$ 2		439			441
Issuance of common stock upon vesting of restricted stock units and exercise of options (in shares)	263,218
Issuance of preferred stock		$ 100	242,141			242,241
Issuance of preferred stock (in shares)		10,000,000
Stock-based compensation			4,174			4,174
Cash dividends				(14,445)		(14,445)
Tax withholding related to vesting of restricted stock units and exercise of stock options	$ (1)		(3,587)			(3,588)
Tax withholding related to vesting of restricted stock units and exercise of stock options (in shares)	(94,899)
Net income				138,094		138,094
Balance at Mar. 31, 2019	$ 1,111	$ 100	2,717,405	2,455,201		5,173,817
Balance (in shares) at Mar. 31, 2019	111,118,169	10,000,000
Balance at Dec. 31, 2018	$ 1,110		2,474,238	2,331,552		4,806,900
Balance (in shares) at Dec. 31, 2018	110,949,850
Increase (Decrease) in Shareholders' Equity
Net income						266,399
Balance at Jun. 30, 2019	$ 1,117	$ 100	2,733,948	2,564,719		5,299,884
Balance (in shares) at Jun. 30, 2019	111,666,126	10,000,000
Balance at Mar. 31, 2019	$ 1,111	$ 100	2,717,405	2,455,201		5,173,817
Balance (in shares) at Mar. 31, 2019	111,118,169	10,000,000
Increase (Decrease) in Shareholders' Equity
Issuance of common stock upon vesting of restricted stock units and upon exercise of options	$ 6		10,791			10,797
Issuance of common stock upon vesting of restricted stock units and exercise of options (in shares)	547,957
Issuance of preferred stock			(111)			(111)
Dividends declared on preferred stock				(4,271)		(4,271)
Stock-based compensation			5,863			5,863
Cash dividends				(14,516)		(14,516)
Net income				128,305		128,305
Balance at Jun. 30, 2019	$ 1,117	$ 100	2,733,948	2,564,719		5,299,884
Balance (in shares) at Jun. 30, 2019	111,666,126	10,000,000
Balance at Dec. 31, 2019	$ 1,134	$ 100	2,777,601	2,846,106	$ (1,397)	5,623,544
Balance (in shares) at Dec. 31, 2019	113,350,267	10,000,000
Increase (Decrease) in Shareholders' Equity
Issuance of common stock upon vesting of restricted stock units and upon exercise of options	$ 4		2,021			2,025
Issuance of common stock upon vesting of restricted stock units and exercise of options (in shares)	480,978
Dividends declared on preferred stock				(3,844)		(3,844)
Stock-based compensation			4,429			4,429
Cash dividends				(17,045)		(17,045)
Change in foreign currency translation adjustment and from current period hedged transactions					(1,478)	(1,478)
Tax withholding related to vesting of restricted stock units and exercise of stock options	$ (2)		(8,411)			(8,413)
Tax withholding related to vesting of restricted stock units and exercise of stock options (in shares)	(191,334)
Net income				137,151		137,151
Balance at Mar. 31, 2020	$ 1,136	$ 100	2,775,640	2,962,368	(2,875)	5,736,369
Balance (in shares) at Mar. 31, 2020	113,639,911	10,000,000
Balance at Dec. 31, 2019	$ 1,134	$ 100	2,777,601	2,846,106	(1,397)	5,623,544
Balance (in shares) at Dec. 31, 2019	113,350,267	10,000,000
Increase (Decrease) in Shareholders' Equity
Change in foreign currency translation adjustment and from current period hedged transactions						(954)
Net income						284,776
Balance at Jun. 30, 2020	$ 1,138	$ 100	2,781,832	3,089,082	(2,351)	5,869,801
Balance (in shares) at Jun. 30, 2020	113,777,723	10,000,000
Balance at Mar. 31, 2020	$ 1,136	$ 100	2,775,640	2,962,368	(2,875)	5,736,369
Balance (in shares) at Mar. 31, 2020	113,639,911	10,000,000
Increase (Decrease) in Shareholders' Equity
Issuance of common stock upon vesting of restricted stock units and upon exercise of options	$ 2		2,500			2,502
Issuance of common stock upon vesting of restricted stock units and exercise of options (in shares)	144,417
Dividends declared on preferred stock				(3,844)		(3,844)
Stock-based compensation			3,892			3,892
Cash dividends				(17,067)		(17,067)
Change in foreign currency translation adjustment and from current period hedged transactions					524	524
Tax withholding related to vesting of restricted stock units and exercise of stock options			(200)			(200)
Tax withholding related to vesting of restricted stock units and exercise of stock options (in shares)	(6,605)
Net income				147,625		147,625
Balance at Jun. 30, 2020	$ 1,138	$ 100	$ 2,781,832	$ 3,089,082	$ (2,351)	$ 5,869,801
Balance (in shares) at Jun. 30, 2020	113,777,723	10,000,000