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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total Debt $ 1,539,244us-gaap_LongTermDebt $ 1,487,091us-gaap_LongTermDebt
Less: current portion (9,855)us-gaap_LongTermDebtCurrent (29,449)us-gaap_LongTermDebtCurrent
Long-term debt 1,529,389us-gaap_LongTermDebtNoncurrent 1,457,642us-gaap_LongTermDebtNoncurrent
Term loans [Member]    
Debt Instrument [Line Items]    
Total Debt 1,132,908us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
1,115,238us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
Trade receivables financing arrangement    
Debt Instrument [Line Items]    
Total Debt 80,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
 
Revolving credit facilities and other [Member]    
Debt Instrument [Line Items]    
Total Debt $ 326,336us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
$ 371,853us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember