Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES (Details)

v2.4.0.8
COMMITMENTS AND CONTINGENCIES (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
helicopter
Dec. 31, 2012
Dec. 31, 2011
Operating Leased Assets [Line Items]      
Unrecorded Unconditional Purchase Obligation $ 341,700,000    
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months 98,700,000    
Deposits Paid on Options Not Yet Exercised 2,300,000    
Unrecorded Unconditional Purchase Obligation Balance Sheet Amount Potential Amount To Reduce Liability 164,400,000    
Unrecorded Unconditional Purchase Obligation Balance Sheet Amount Related To Liquidated Damage 11,100,000    
Lessee Leasing Arrangements, Number of Helicopters Leased 5    
Operating Leases, Rent Expense 6,000,000 4,000,000 4,300,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity      
2014 3,060,000    
2015 2,017,000    
2016 1,779,000    
2017 1,543,000    
2018 1,341,000    
Years subsequent to 2018 $ 8,619,000    
Minimum [Member]
      
Operating Leased Assets [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 1 year    
Maximum [Member]
      
Operating Leased Assets [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 10 years