Segment Information (Entity-Wide Disclosures) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Customer revenues	$ 465,955	$ 404,146	$ 1,251,915	$ 1,171,217
Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	465,955	404,146	1,251,915	1,171,217
CAM [Member]
Segment Reporting Information [Line Items]
Customer revenues	92,931	76,268	264,802	225,301
CAM [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	71,070	51,409	198,546	148,104
All other [Member]
Segment Reporting Information [Line Items]
Customer revenues	90,292	82,281	281,226	239,373
All other [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	$ 63,982	$ 52,548	$ 202,044	$ 151,168