Shareholders’ Equity (Tables)

3 Months Ended

Mar. 31, 2019

Stockholders' Equity Note [Abstract]

Common and Preferred Stock Activity

The Common and Preferred Stock table below contains additional information about preferred stock conversions during the three months ended March 31, 2019 and 2018.

	Preferred stock		Common stock
Common and Preferred Stock Activity (in shares):	Series A convertible		Treasury	Outstanding
Beginning balance as of December 31, 2018	71,967		7,186,521	88,103,440
Conversion of convertible preferred stock	(3,023	)	—	302,255
Issuance for share-based compensation plans	—		—	402,062
Ending balance as of March 31, 2019	68,944		7,186,521	88,807,757
Beginning balance as of December 31, 2017	74,364		7,186,521	87,544,777
Conversion of convertible preferred stock	(133	)	—	13,343
Issuance for share-based compensation plans	—		—	17,749
Ending balance as of March 31, 2018	74,231		7,186,521	87,575,869