Fair Value of Financial Instruments - Other Investments - Other Equity Method Investments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		30 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, net investment	$ 321,000			$ 321,000		$ 321,000	$ 306,000
Equity method investments, equity contributions	200			200
Equity method investments, equity in earnings (losses)	7,496		$ 6,587	16,648	$ 13,364
Subcontracting Arrangements | Related Party
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Operating costs and expenses	700		500	1,200	700
Accounts payable	100			100		100	300
Accounts receivable, after allowance for credit loss	50,400			50,400		50,400	42,000
Telecommunications Equity Method Investees
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, net investment	22,000			22,000		22,000	21,000
Equity method investments, equity contributions	0		600	0	1,100
Equity method investments, equity in earnings (losses)	(100)		(500)	1,000	(900)
Payments for advance to affiliate	400		0	400	0
Telecommunications Equity Method Investees | Subcontracting Arrangements | Related Party
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Operating costs and expenses	500		1,600	1,000	2,500
Accounts payable	200			200		200	200
Telecommunications Equity Method Investees | Employee Leasing and Advanced Receivable Arrangement | Related Party
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Accounts receivable, after allowance for credit loss	4,100			4,100		4,100	3,800
FM Tech
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, net investment	$ 18,000			$ 18,000		$ 18,000	18,000
Equity method investments, ownership percentage	50.00%			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	$ 3,000			$ 3,000		$ 3,000	$ 3,000
Equity method investments, equity in earnings (losses)	$ 200		(200)	$ 100	(300)
Equity method investments, ownership percentage	49.00%			49.00%		49.00%	49.00%
Line of credit, amount drawn	$ 3,000			$ 3,000		$ 3,000	$ 4,500
Certain Entities, Each Accounted for Using Equity Method Investments | Related Party
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Operating costs and expenses	200		1,400	600	5,000
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	$ 0			0		0	$ 600
Confluence
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, equity contributions				200	200	$ 2,100
Equity method investments, equity in earnings (losses)			$ (100)	$ (100)	$ (300)
Equity method investments, ownership percentage	75.00%			75.00%		75.00%
Financing commitments (up to)								$ 2,500
AVCT | Corporate
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity investments written off		$ 200