Segments and Related Information (Reconciliation of Consolidated Income before Income Taxes to EBITDA) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
EBITDA Reconciliation:
Income before income taxes	$ 510,939	$ 365,303	$ 371,826
Interest expense, net	77,026	82,571	61,011
Depreciation and amortization	235,482	212,930	188,049
EBITDA	$ 823,400	$ 660,800	$ 620,900