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Revenue Recognition (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Revenue Recognition [Abstract]    
Performance obligation, description of timing The agreements range in term from less than one year to 25 or more years, with certain agreements containing extension options. These extension options range from as little as one month to five or more years.  
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]    
2019 (remaining six months) $ 425,074  
2020 788,053  
2021 679,989  
2022 567,552  
2023 468,037  
Thereafter $ 1,639,648  
Operating Leases, Future Minimum Payments Receivable [Abstract]    
2019   $ 811,381
2020   709,230
2021   599,367
2022   490,087
2023   392,892
Thereafter   $ 1,368,278