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Revenue Recognition (Contract Balances) (Details) $ in Thousands | 3 Months Ended
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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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