Equity Textuals (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended
	Jul. 28, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 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		186,104,673			186,104,673		185,100,789
Common stock, shares outstanding		177,011,040			177,011,040		181,184,963
Treasury Stock, Shares, Acquired					5,177,807
Treasury Stock, Value, Acquired, Par Value Method					$ 210,600
Treasury Stock Acquired, Average Cost Per Share					$ 40.67
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 106,200			$ 106,200
Dividends declared per share		$ 190		$ 180
Payments of Dividends, Common Stock					$ 68,133	$ 65,691
Subsequent Event [Member]
Treasury Stock, Shares, Acquired	791,744
Treasury Stock, Value, Acquired, Par Value Method	$ 30,400
Treasury Stock Acquired, Average Cost Per Share	$ 38.40
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 75,800