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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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