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Revenue Recognition (Contract Balances) (Details) $ in Thousands | 9 Months Ended
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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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