Annual report pursuant to Section 13 and 15(d)

INVESTMENTS, AT EQUITY, ADVANCES TO 50% OR LESS OWNED COMPANIES Era do Brazil Narrative (Details)

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INVESTMENTS, AT EQUITY, ADVANCES TO 50% OR LESS OWNED COMPANIES Era do Brazil Narrative (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 6 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Equity Method Investee [Member]
Era do Brazil [Member]
note_receivable
Jul. 02, 2011
Era do Brazil [Member]
Dec. 31, 2012
Era do Brazil [Member]
Dec. 31, 2013
Era do Brazil [Member]
Jul. 02, 2011
Era do Brazil [Member]
Co-venturer [Member]
Dec. 31, 2011
Era do Brazil [Member]
Equity Method Investee [Member]
Sep. 30, 2012
Era do Brazil [Member]
Equity Method Investee [Member]
Dec. 31, 2012
Era do Brazil [Member]
Equity Method Investee [Member]
note_receivable
Jul. 02, 2011
Era do Brazil [Member]
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]                        
Cash paid $ 0 $ 10,627,000 $ 21,840,000   $ 4,800,000     $ 4,800,000        
Ownership         50.00%   50.00% [1]          
Consideration received         11,500,000              
Cash from sale of leased equipment         9,500,000              
Notes receivable to related party       9,200,000             10,800,000 2,000,000
Proceeds from related party debt           1,600,000            
Number of notes receivable to related parties       2             2  
Revenue from related parties                 $ 300,000 $ 400,000    
[1] Consolidated entity as of September 30, 2012.