Equity Textuals (Details) - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended	3 Months Ended	12 Months Ended
	Feb. 17, 2020	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Purchase of noncontrolling interest			$ 0	$ 0	$ 4,580
Preferred Stock, Shares Authorized			1,000,000
Preferred Stock, Par or Stated Value Per Share			$ 1
Common stock, shares authorized			500,000,000	500,000,000
Common stock, par or stated value per share			$ 1	$ 1
Common stock, shares, issued			185,100,789	184,720,582
Common stock, shares outstanding			181,184,963	181,470,582
Treasury Stock, Shares, Acquired			2,908,850	7,347,838
Treasury Stock, Value, Acquired, Par Value Method			$ 129,600	$ 277,600
Treasury Stock Acquired, Average Cost Per Share			$ 44.55	$ 37.78
Stock Repurchase Program, Authorized Amount			$ 400,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 312,000
Dividends declared per share		$ 0.51	$ 0.68	$ 0.58
Payments of Dividends, Common Stock			$ 131,402	$ 123,849	$ 108,750
Subsequent Event [Member]
Treasury Stock, Shares, Acquired	475,476
Treasury Stock, Value, Acquired, Par Value Method	$ 22,200
Treasury Stock Acquired, Average Cost Per Share	$ 46.69