Income Taxes and Distributions (Reconciliation of Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax at statutory rate on earnings from continuing operations before unconsolidated entities, noncontrolling interests and income taxes	$ 176,069	$ 199,588	$ 372,030
Increase (decrease) in valuation allowance	28,309	30,445	(2,128)
Tax at statutory rate on earnings not subject to federal income taxes	(206,937)	(234,468)	(399,571)
Foreign permanent depreciation	8,110	10,065	9,205
Other differences	3,123	14,498	1,336
Totals	$ 8,674	$ 20,128	$ (19,128)