Equity Investees (Schedule of Balance Sheet Information for Equity Investees) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
Current assets	$ 21,646	$ 18,911
Fixed assets, net	190,570	202,116
Other assets	2,207	886
Total assets	214,423	221,913
Liabilities and equity
Current liabilities	14,267	15,909
Other liabilities	244,057	242,881
Equity	(43,901)	(36,877)
Total liabilities and equity	$ 214,423	$ 221,913