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Income Taxes (Deferred Tax Assets and Liabilities, Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Current    
Other $ 0 $ 7
Noncurrent    
Other 296 1,696
Property and equipment 240 187
Valuation allowance 0 (376)
Total deferred tax assets 536 1,514
Current    
Other 0 (417)
Noncurrent    
Investment in partnership (39,962) (35,182)
Other (295) (139)
Total deferred liabilities (40,257) (35,738)
Net deferred tax liabilities $ (39,721) $ (34,224)