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Other long-term liabilities - Finance lease obligations (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments $ 370,274
Interest component 171,900
Finance lease obligations 198,374
2019  
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments 32,222
Interest component 22,990
Finance lease obligations 9,232
2020  
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments 32,614
Interest component 22,001
Finance lease obligations 10,613
2021  
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments 33,014
Interest component 20,837
Finance lease obligations 12,177
2022  
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments 33,422
Interest component 19,473
Finance lease obligations 13,949
2023  
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments 32,779
Interest component 17,915
Finance lease obligations 14,864
Thereafter  
Disclosure of finance lease and operating lease by lessee [line items]  
Lease payments 206,223
Interest component 68,684
Finance lease obligations $ 137,539