Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Trade receivables, allowance for doubtful accounts	$ 5,283	$ 4,860
Common stock, par value (dollars per share)	$ 0	$ 0
Preferred Stock
Preferred stock, dividend rate (percentage)	4.50%	4.50%
Preferred stock, par value (dollars per share)	$ 50	$ 50