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Fair Value of Financial Instruments - Other Investments - Other Equity Method Investments - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |  |  |  |
Equity method investments, equity in earnings (losses) | $ 8,714,000 |  | $ 7,445,000 | $ 23,585,000 | $ 22,092,000 |
Equity method investments, net investment | 250,000,000 |  |  | 250,000,000 |  | $ 220,000,000
Confluence |  |  |  |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |  |  |  |
Equity method investments, ownership percentage |  | 75.00% |  |  |  |
Equity method investments, equity contributions | 300,000 |  |  | 1,300,000 |  |
Equity method investments, equity in earnings (losses) | (200,000) |  |  | (600,000) |  |
Confluence | Maximum |  |  |  |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |  |  |  |
Financing commitments |  | $ 2,500,000 |  |  |  |
Telecommunications Equity Method Investees |  |  |  |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |  |  |  |
Equity method investments, equity contributions | 0 |  |  | 2,000,000 |  |
Equity method investments, equity in earnings (losses) | 1,000,000 |  |  |  | (1,000,000) |
Equity method investments, net investment | 20,000,000 |  |  | 20,000,000 |  | 19,000,000
Payments for advance to affiliate | 0 |  |  | 200,000 |  |
Telecommunications Equity Method Investees | Subcontracting Arrangements |  |  |  |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |  |  |  |
Expenses, related party | 3,200,000 |  | 2,700,000 | 7,300,000 | 9,000,000 |
Payables, related party | 200,000 |  |  | 200,000 |  | 200,000
Telecommunications Equity Method Investees | Employee Leasing Arrangement |  |  |  |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |  |  |  |
Expenses, related party |  |  | $ 100,000 |  | $ 300,000 |
Receivables, related party | $ 500,000 |  |  | $ 500,000 |  | 400,000
FM Tech |  |  |  |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |  |  |  |
Equity method investments, ownership percentage | 50.00% |  |  | 50.00% |  |
Equity method investments, equity contributions |  | $ 2,000,000 |  |  |  |
Equity method investments, net investment | $ 17,000,000 |  |  | $ 17,000,000 |  | 16,000,000
FM Tech | Equity Method Investments |  |  |  |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |  |  |  |
Financing commitments | $ 3,000,000 |  |  | $ 3,000,000 |  | $ 9,000,000

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