Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' Equity Note [Abstract]

Schedule of Stockholders Equity

The following table summarizes the changes in shares of Common Stock outstanding and Treasury Stock:

	Common Stock Outstanding		Treasury Stock
Balance at December 31, 2016	185,668,718		137,669,194
Issuance of common stock	881,480		(881,480	)
Conversions to common stock	53,540		(53,540	)
Balance at December 31, 2017	186,603,738		136,734,174
Issuance of common stock	1,043,809		(1,043,809	)
Conversions to common stock	27,535		(27,535	)
Balance at December 31, 2018	187,675,082		135,662,830
Repurchases of common stock	(18,595,315	)	18,595,315
Issuance of common stock	1,276,797		(1,276,797	)
Conversions to common stock	92,379		(92,379	)
Balance at December 31, 2019	170,448,943		152,888,969