Segments and Related Information (Reconciliation of Consolidated Income before Income Taxes to EBITDA) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
EBITDA Reconciliation:
Income before income taxes	$ 102,827	$ 77,565	$ 198,256	$ 114,050
Interest expense, net	13,829	14,808	26,288	31,812
Depreciation	87,501	57,687	166,766	110,776
Amortization of intangible assets	19,923	9,793	31,170	17,184
EBITDA	$ 224,100	$ 159,900	$ 422,500	$ 273,800