Segments and Related Information (Reconciliation of Consolidated Income before Income Taxes to EBITDA) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
EBITDA Reconciliation:
Income before income taxes	$ 95,429	$ 36,485
Interest expense, net	12,459	17,004
Depreciation	79,264	53,089
Amortization of intangible assets	11,247	7,391
EBITDA	$ 198,400	$ 114,000