Equity Investees (Schedule of Balance Sheet Information For Equity Investees) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 35,375	$ 36,566
Fixed assets, net	365,563	452,413
Other assets	3,177	2,040
Total assets	404,115	491,019
Current liabilities	23,928	25,308
Other liabilities	230,327	231,032
Equity	149,860	234,679
Total liabilities and equity	$ 404,115	$ 491,019