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Fair Value of Financial Instruments (Other Investments - Telecommunications Entities) (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
Equity method investments, net investment | $ 220,000 | $ 196,000 |
Equity method investments, equity in earnings (losses) | 29,738 | 27,367 | $ 23,855
Equity Investee [Member] | Subcontracting Arrangements [Member] |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
Payments, related party | 11,500 | $ 7,000 |
Payables, related party | 200 |  |
FM Tech [Member] |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
Equity method investments, net investment | 16,000 |  |
Telecommunications Equity Method Investees |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
Equity method investments, equity in earnings (losses) | $ (1,500) |  |

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