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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]              
Equity method investments, net investment $ 288,000,000   $ 288,000,000     $ 267,000,000  
Equity method investments, equity in earnings (losses) 6,587,000 $ 7,525,000 13,364,000 $ 14,871,000      
Telecommunications Equity Method Investees              
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]              
Equity method investments, net investment 20,000,000   20,000,000     20,000,000  
Equity method investments, equity contributions 600,000 0 1,100,000 2,000,000      
Equity method investments, equity in earnings (losses) (500,000) (1,000,000) (900,000) (1,000,000)      
Payments for advance to affiliate 0   0 200,000      
Telecommunications Equity Method Investees | Subcontracting Arrangements              
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]              
Expenses, related party 1,600,000 2,400,000 2,500,000 4,100,000      
Payables, related party 100,000   100,000     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 600,000   600,000     900,000  
FM Tech              
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]              
Equity method investments, net investment $ 18,000,000   $ 18,000,000     17,000,000  
Equity method investments, ownership percentage 50.00%   50.00%        
Certain Entities, Each Accounted for Using Equity Method Investments              
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]              
Equity method investments, net investment   4,000,000   4,000,000   4,000,000  
Equity method investments, equity in earnings (losses) $ 200,000   $ 300,000        
Expenses, related party $ 1,400,000   $ 5,000,000        
Equity method investments, ownership percentage 49.00%   49.00%        
Payables, related party $ 100,000   $ 100,000        
Line of credit, amount drawn 4,500,000   4,500,000     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 500,000   500,000     $ 400,000  
Confluence              
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]              
Equity method investments, equity contributions 200,000 600,000 1,900,000 1,000,000      
Equity method investments, equity in earnings (losses) $ (100,000) $ 300,000 $ (300,000) $ 300,000      
Equity method investments, ownership percentage         75.00%    
Financing commitments (up to)             $ 2,500,000