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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Income Taxes [Line Items]      
Provision for income taxes $ 26 $ 39  
Loss before taxes and equity in net income of unconsolidated entities (8,570) $ (5,355)  
Deferred gain on disposal     $ 77,500
Increase (decrease) in valuation allowance 1,800    
Periods Ending December 31, 2016 Through December 31, 2018      
Income Taxes [Line Items]      
Deferred gain from disposition of qualifying vessels remaining amount 31,900    
Qualifying replacement property to be acquired to meet non-recognition requirements 52,200    
Foreign [Member]      
Income Taxes [Line Items]      
Deferred tax liability $ 217