Income Taxes (Reconciliation of Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of income tax expense computed by applying federal corporate tax rate
Tax at statutory rate on earnings from continuing operations before unconsolidated entities, noncontrolling interest and income taxes	$ 77,803	$ 80,811	$ 204,742
State income taxes, net of federal benefit	2,341	(253)	(1,115)
Change in valuation allowance from ordinary operations	(47,227)	(5,451)	8,237
Decrease in ASC 740 income tax liability	0	(4,347)	(4,750)
Tax at statutory rate on earnings not subject to federal income taxes	(90,862)	(89,947)	(231,379)
Foreign rate differential and foreign taxes	1,407	1,924	6,407
Change in tax status of TRS	(52)	359	(690)
Effect of the 2017 Tax Act	0	(23,160)	(41,212)
Other differences	280	111	(39)
Income tax benefit	$ (56,310)	$ (39,953)	$ (59,799)