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Commitments and Contingencies (Future Payments) (Details)
ft² in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jul. 31, 2016
ft²
Future minimum lease payments under noncancelable operating leases        
2019 $ 67,682      
2020 64,237      
2021 56,142      
2022 52,759      
2023 52,522      
Thereafter 383,974      
Future minimum lease payments under noncancelable operating leases, Total 677,316      
Change of control provisions in debt covenants        
Expenses related to operating leases 32,200 $ 29,300 $ 29,000  
Future noncancelable purchase commitments        
2019 224,253      
2020 184,308      
2021 136,917      
2022 79,401      
2023 45,266      
Thereafter 149,696      
Future noncancelable purchase commitments, Total $ 819,841      
Credit agreement        
Change of control provisions in debt covenants        
Number of months considered to determine requirement of prepayment of debts 24 months      
Lower Limit | Credit agreement        
Change of control provisions in debt covenants        
Debt instrument covenant, minimum percentage of ownership by a person 50.00%      
Lower Limit | Debt Securities        
Change of control provisions in debt covenants        
Debt instrument covenant, minimum percentage of ownership by a person 50.00%      
Port of Miami Terminal        
Change of control provisions in debt covenants        
Expected size of terminal | ft²       170
Terminal lease term, term of contract       5 years