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LONG-TERM OBLIGATIONS, GMSL Capital Leases (Details)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
Lease
vessel
ExtensionOption
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]    
Number of leases | Lease 2  
Number of vessels | vessel 2  
Lease principal amount outstanding $ 56.4 $ 65.2
Innovator Lease [Member]    
Debt Instrument [Line Items]    
Number of lease extension options | ExtensionOption 4  
Lease extension period 1 year  
Fixed interest rate (in hundredths) 10.40%  
Lease expiration period 2018  
Cable Lease [Member]    
Debt Instrument [Line Items]    
Fixed interest rate (in hundredths) 4.00%  
Lease expiration period 2023