Segment Information (Entity-Wide Disclosures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Customer revenues	$ 409,872	$ 377,794	$ 785,960	$ 767,071
Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	409,872	377,794	785,960	767,071
CAM [Member]
Segment Reporting Information [Line Items]
Customer revenues	88,594	74,870	171,871	149,033
CAM [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	66,676	49,959	127,476	96,695
All other [Member]
Segment Reporting Information [Line Items]
Customer revenues	97,236	77,056	190,934	157,092
All other [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	$ 69,901	$ 40,240	$ 138,062	$ 98,620