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Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items] |  |  |
Retainage, expected collection period (in years) | 1 year |  |
Contract liabilities | $ 228,388 | $ 206,180 |
Contract with customer liability deferred revenue current | 203,000 | 184,100 |
Deferred revenue, revenue recognized | 159,600 | 199,200 |
Non-recourse financing agreement, discount charge | (59,629) | (77,026) | $ (82,571)
Accounts receivable, credit loss expense (reversal) | 12,100 | 1,700 |
Amounts charged against the allowance | 1,700 | 7,900 |
Receivables, Non-Recourse Arrangement [Member] |  |  |
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items] |  |  |
Non-recourse financing agreement, discount charge | $ (5,000) | $ (10,100) | $ (11,100)
Minimum [Member] |  |  |
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items] |  |  |
Retainage, percentage of contract billings | 5.00% |  |
Maximum [Member] |  |  |
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 direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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