Segments and Related Information (Reconciliation of Consolidated Income before Income Taxes to EBITDA) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
EBITDA Reconciliation:
Income before income taxes	$ 157,405	$ 173,385	$ 271,455	$ 388,484
Interest expense, net	13,553	19,297	45,365	58,178
Depreciation	71,397	50,515	182,173	160,019
Amortization of intangible assets	11,200	4,681	28,384	14,152
EBITDA	$ 253,600	$ 247,900	$ 527,400	$ 620,800