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Revenues - Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Unbilled receivable | $ 25,500 | $ 27,147
Revenue, Remaining Performance Obligation, Amount | 3,300,000 |
ASUS |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Unbilled receivable | 16,378 | 14,835
Receivable from the U.S. government | 72,444 | 79,818
Contract assets | 12,571 | 9,587
Contract liabilities | $ 210 | $ 257
Maximum | ASUS |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation | 46 |
Minimum | ASUS |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation | 33 |
Contracted Services | ASUS |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years |

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details
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