STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock Member	Additional Paid In Capital Member	Retained Earnings Member	Accumulated Other Comprehensive Income Member	Treasury Stock Member
Beginning Balance at Dec. 31, 2016		$ 49,187	$ 129,483	$ 1,754,907	$ (291,756)	$ (350,630)
Net earnings	$ 214,891			214,891
Other Comprehensive Income (Loss), Net of Tax	74,916				74,916
Dividends paid				(24,740)
Restricted Stock			(12,104)			12,105
Stock options exercised, net			(5,724)			19,902
Other			(2,237)	(734)		889
Share-based compensation			11,191			381
Repurchase of common stock						(52,127)
Ending Balance at Dec. 31, 2017		49,187	120,609	1,944,324	(216,840)	(369,480)
Net earnings	275,749			275,749
Other Comprehensive Income (Loss), Net of Tax	(71,607)				(71,607)
Dividends paid				(26,328)
Restricted Stock			(13,134)			13,134
Stock options exercised, net			(2,355)			14,294
Other			(752)			752
Share-based compensation			13,866			228
Repurchase of common stock						(198,592)
Ending Balance at Dec. 31, 2018	1,530,781	49,187	118,234	2,191,471	(288,447)	(539,664)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2014-09 [Member]				(2,274)
Net earnings	307,583
Other Comprehensive Income (Loss), Net of Tax	(10,570)				(10,570)
Dividends paid				(28,200)
Restricted Stock			(10,483)			10,483
Stock options exercised, net			(4,226)			15,996
Other			(719)			719
Share-based compensation			13,264			405
Repurchase of common stock						(50,661)
Ending Balance at Dec. 31, 2019	$ 1,774,372	$ 49,187	$ 116,070	2,497,111	(325,274)	$ (562,722)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2018-02 [Member]				$ 26,257	$ (26,257)