Equity Textuals (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 28, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Common stock, shares authorized		500,000,000		500,000,000
Common stock, par or stated value per share		$ 1		$ 1
Common stock, shares, issued		186,057,728		185,100,789
Common stock, shares outstanding		179,241,180		181,184,963
Treasury Stock, Shares, Acquired		2,900,722
Treasury Stock, Value, Acquired, Par Value Method		$ 123,100
Treasury Stock Acquired, Average Cost Per Share		$ 42.44
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 193,700
Dividends declared per share		$ 190	$ 180
Payments of Dividends, Common Stock		$ 34,414	$ 32,820
Subsequent Event [Member]
Treasury Stock, Shares, Acquired	1,097,361
Treasury Stock, Value, Acquired, Par Value Method	$ 41,800
Treasury Stock Acquired, Average Cost Per Share	$ 38.09
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 151,900