v3.20.4

Contract assets and contract liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Contract Assets, Net |  |  |
Balance at December 31 | $ 967 | $ 468 |
Balance at December 31 | 547 | 967 | $ 468
Change | (420) | 499 |
Contract Liabilities, Net |  |  |
Balance at December 31 | 227,889 | 217,733 |
Balance at December 31 | 224,754 | 227,889 | 217,733
Change | (3,135) | 10,156 |
Contract liability and performance obligations included in revenue |  |  |
Amounts included in the beginning of period contract liability balance | 84,368 | 88,890 | 85,592
Amounts associated with performance obligations satisfied in previous periods | $ (55) | $ 447 | $ 378
Revenue performance obligations |  |  |
Practical expedient of remaining performance obligations | true |  |
Carrier Services |  |  |
Revenue performance obligations |  |  |
Remaining service performance obligations | $ 210,290 |  |
Carrier Services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Minimum |  |  |
Revenue performance obligations |  |  |
Remaining duration of contracts | 1 year |  |
Carrier Services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Maximum |  |  |
Revenue performance obligations |  |  |
Remaining duration of contracts | 14 years |  |
Military |  |  |
Revenue performance obligations |  |  |
Remaining service performance obligations | $ 2,774 |  |
Military | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Minimum |  |  |
Revenue performance obligations |  |  |
Remaining duration of contracts | 1 year |  |
Military | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Maximum |  |  |
Revenue performance obligations |  |  |
Remaining duration of contracts | 8 years |  |
Legacy Wholesale Partner Arrangement |  |  |
Revenue performance obligations |  |  |
Remaining service performance obligations | $ 5,484 |  |
Legacy Wholesale Partner Arrangement | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Minimum |  |  |
Revenue performance obligations |  |  |
Remaining duration of contracts | 1 year |  |
Legacy Wholesale Partner Arrangement | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Maximum |  |  |
Revenue performance obligations |  |  |
Remaining duration of contracts | 14 years |  |

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