Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock, Common [Member]	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
January 1, 2020			(2,272)
January 1, 2020			(4,915)
January 1, 2020 at Dec. 31, 2018	$ 4,838,752	$ 3,184	$ (60,000)	$ 1,415,188	$ 3,598,876	$ (174,950)	$ 56,454
January 1, 2020 at Dec. 31, 2018		318,418
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	99,063				98,048		1,015
Other comprehensive loss	(15,904)					(15,904)
Purchase of treasury stock			(2,643)
Purchase of treasury stock	(70,462)
Restricted Stock Units Vested Shares Net Of Tax Withholdings		303
Vesting of restricted stock units, net of shares withheld for employee tax	(1,077)	$ 3		(1,080)
Stock-based compensation expense	5,673			5,673
Exercise of stock options		183
Exercise of stock options	1,334	$ 2		1,332
Tax withholdings related to net share settlements of stock-based compensation awards		(15)
Tax withholdings related to net share settlements of stock-based compensation awards	428			428
Capital contributions from, net of dividends declared to, noncontrolling interest shareholder	(177)						177
March 31, 2020 at Mar. 31, 2019			(4,915)
March 31, 2020 at Mar. 31, 2019	4,856,774	$ 3,189	$ (130,462)	1,420,685	3,696,924	(190,854)	57,292
March 31, 2020 at Mar. 31, 2019		318,889
Increase (Decrease) in Stockholders' Equity [Roll Forward]
January 1, 2020			(4,915)
January 1, 2020			(13,196)
January 1, 2020			(16,496)
January 1, 2020 at Dec. 31, 2019	5,048,580	$ 3,199	$ (351,813)	1,418,239	4,140,136	(200,885)	39,704
January 1, 2020 at Dec. 31, 2019		319,927
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	145,979				145,136		843
Other comprehensive loss	(113,018)					(113,018)
Purchase of treasury stock			(3,300)
Purchase of treasury stock	(88,006)		$ (88,006)
Restricted Stock Units Vested Shares Net Of Tax Withholdings		400
Vesting of restricted stock units, net of shares withheld for employee tax	(2,069)	$ 4		(2,073)
Stock-based compensation expense	7,968			7,968
Exercise of stock options		112
Exercise of stock options	1,467	$ 1		1,466
Capital contributions from, net of dividends declared to, noncontrolling interest shareholder	341						341
Adoption of ASU 2016-13 (see Note 3) | Accounting Standards Update 2016-13 [Member]	(2,519)				(2,519)
Disposition of subsidiary with noncontrolling interests(1)	(11,404)						(11,404)
March 31, 2020 at Mar. 31, 2020			(16,496)
March 31, 2020 at Mar. 31, 2020	$ 4,987,319	$ 3,204	$ (439,819)	$ 1,425,600	$ 4,282,753	$ (313,903)	$ 29,484
March 31, 2020 at Mar. 31, 2020		320,439
Increase (Decrease) in Stockholders' Equity [Roll Forward]
January 1, 2020			(16,496)