Equity Investees (Schedule of Balance Sheet Information for Equity Investees) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 18,638	$ 17,111
Fixed assets, net	221,123	232,736
Other assets	1,282	861
Total assets	241,043	250,708
Current liabilities	20,683	20,727
Other liabilities	231,469	219,644
Equity	(11,109)	10,337
Total liabilities and equity	$ 241,043	$ 250,708