Equity Investees (Schedule of Balance Sheet Information for Equity Investees) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets
Current assets	$ 17,230	$ 18,911
Fixed assets, net	194,398	202,116
Other assets	2,310	886
Total assets	213,938	221,913
Liabilities and equity
Current liabilities	16,611	15,909
Other liabilities	237,158	242,881
Equity	(39,831)	(36,877)
Total liabilities and equity	$ 213,938	$ 221,913