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Revenue Recognition (Contract Balances) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Trade accounts receivable, net
Balance, January 1, 2021	$ 18,894
Balance, March 31, 2021	22,301
Increase (decrease) in trade accounts receivables, net	3,407
Contract asset (current)
Balance, January 1, 2021	0
Balance, March 31, 2021	3,503
Increase (decrease) in contract asset (current)	3,503
Contract asset (long-term)
Balance, January 1, 2021	4,984
Balance, March 31, 2021	5,078
Increase (decrease) in contract asset (long-term)	94
Contract liability (current)
Balance, January 1, 2021	941
Balance, March 31, 2021	913
Increase (decrease) in contract liability (current)	(28)
Contract liability (long-term)
Balance, January 1, 2021	3,626
Balance, March 31, 2021	4,267
Increase (decrease) in contract liability (long-term)	$ 641

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