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Equity Investees (Schedule of Balance Sheet Information for Equity Investees) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets    
Current assets $ 15,495 $ 18,911
Fixed assets, net 198,289 202,116
Other assets 2,184 886
Total assets 215,968 221,913
Liabilities and equity    
Current liabilities 17,217 15,909
Other liabilities 237,778 242,881
Equity (39,027) (36,877)
Total liabilities and equity $ 215,968 $ 221,913