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Fair Value of Financial Instruments (Other Investments - Other Equity Method Investments) (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |  |  |  |
Equity method investments, equity in earnings (losses) | $ 7,525,000 |  | $ 6,813,000 | $ 14,871,000 | $ 14,647,000 |
Equity method investments, net investment | $ 248,000,000 |  |  | $ 248,000,000 |  | $ 220,000,000
Confluence |  |  |  |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |  |  |  |
Equity method investments, ownership percentage | 75.00% |  |  | 75.00% |  |
Equity method investments, equity contributions | $ 600,000 |  |  | $ 1,000,000.0 |  |
Equity method investments, equity in earnings (losses) | (300,000) |  |  | (300,000) |  |
Confluence | Maximum |  |  |  |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |  |  |  |
Financing commitments | 2,500,000 |  |  | 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 |  | 0 | 2,000,000 | 0 |
Equity method investments, equity in earnings (losses) | (1,000,000) |  | (1,000,000) | (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 | 2,400,000 |  | 3,600,000 | 4,100,000 | 6,300,000 |
Payables, related party | 500,000 |  |  | 500,000 |  | 200,000
Telecommunications Equity Method Investees | Employee Leasing Arrangement |  |  |  |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |  |  |  |
Expenses, related party |  |  | $ 200,000 |  | $ 200,000 |
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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