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Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items] |  |  |  |  |
Provision for credit losses |  |  | $ (11,000) | $ 12,300 |
Contract liabilities | $ 238,853 |  | 238,853 |  | $ 228,388
Contract with customer liability, deferred revenue current | 217,400 |  | 217,400 |  | $ 203,000
Deferred revenue, revenue recognized | 19,300 |  | 166,100 |  |
Non-recourse financing agreement, discount charge | (13,829) | $ (14,808) | (26,288) | (31,812) |
Receivables, Non-Recourse Arrangement |  |  |  |  |
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items] |  |  |  |  |
Non-recourse financing agreement, discount charge | $ (800) | $ (1,400) | $ (1,500) | $ (3,200) |
Minimum |  |  |  |  |
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items] |  |  |  |  |
Retainage, percentage of contract billings |  |  | 5.00% |  |
Maximum |  |  |  |  |
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items] |  |  |  |  |
Retainage, percentage of contract billings |  |  | 10.00% |  |

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 Reference 3: 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 + Details
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