Equity Investees (Schedule of Balance Sheet Information for Equity Investees) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Current assets	$ 44,129	$ 34,005
Fixed assets, net	321,752	346,864
Other assets	16,739	15,469
Total assets	382,620	396,338
Liabilities and equity
Current liabilities	20,081	18,897
Other liabilities	252,331	250,742
Equity	110,208	126,699
Total liabilities and equity	$ 382,620	$ 396,338