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Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Trade receivables, allowance for doubtful accounts	$ 4,950	$ 5,369
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

X

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Amount of allowance for credit loss on accounts receivable, classified as current.

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