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Other long-term liabilities - Finance lease obligations (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments $ 397,876
Interest component 193,634
Finance lease obligations 204,242
2018  
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments 31,447
Interest component 23,549
Finance lease obligations 7,898
2019  
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments 31,826
Interest component 22,727
Finance lease obligations 9,099
2020  
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments 32,213
Interest component 21,756
Finance lease obligations 10,457
2021  
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments 32,608
Interest component 20,612
Finance lease obligations 11,996
2022  
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments 33,010
Interest component 19,271
Finance lease obligations 13,739
Thereafter  
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments 236,772
Interest component 85,719
Finance lease obligations $ 151,053