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Fair Value of Financial Instruments - Other Investments - Other Equity Method Investments - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investments, equity in earnings (losses) $ 6,777,000 $ 7,346,000  
Equity method investments, net investment $ 280,000,000   $ 267,000,000
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 $ 1,700,000 400,000  
Equity method investments, equity in earnings (losses) $ (200,000) (100,000)  
Confluence | Maximum      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Financing commitments   2,500,000  
FM Tech      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investments, ownership percentage 50.00%    
Equity method investments, net investment $ 17,000,000   17,000,000
Telecommunications Equity Method Investees      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investments, equity contributions 500,000 2,000,000  
Equity method investments, equity in earnings (losses) (300,000) (300,000)  
Equity method investments, net investment 20,000,000   20,000,000
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 1,000,000 1,800,000  
Payables, related party     300,000
Telecommunications Equity Method Investees | Employee Leasing and Advanced Receivable Arrangement      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Receivables, related party $ 700,000   900,000
Certain Entities, Each Accounted for Using Equity Method Investments      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investments, ownership percentage 49.00%    
Equity method investments, equity in earnings (losses) $ 100,000    
Equity method investments, net investment   $ 4,000,000 4,000,000
Expenses, related party 3,600,000    
Payables, related party 100,000    
Line of credit, amount drawn 8,500,000    
Certain Entities, Each Accounted for Using Equity Method Investments | Other Current Assets      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Line of credit, amount drawn $ 400,000   $ 400,000