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Revenue Recognition (Contract Balances) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Trade accounts receivable, net
Balance, January 1, 2021	$ 18,894
Balance, September 30, 2021	19,127
Increase (decrease) in trade accounts receivables, net	233
Contract asset (long-term)
Balance, January 1, 2021	4,984
Balance, September 30, 2021	5,790
Increase (decrease) in contract asset (long-term)	806
Contract liability (current)
Balance, January 1, 2021	941
Balance, September 30, 2021	824
Increase (decrease) in contract liability (current)	(117)
Contract liability (long-term)
Balance, January 1, 2021	3,626
Balance, September 30, 2021	3,683
Increase (decrease) in contract liability (long-term)	$ 57

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