Net Income Per Common Share (Narrative) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Tangible equity units	10,215,189
Number Of SharesTo Be Issued Basic Stock Purchase Contracts	9,091,432
Employee stock-based compensation	472,000	339,000
Treshold	$ 42.41
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Employee stock-based compensation		776,211