Debt - Future Minimum Principal Payments for Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
2019	$ 2,455
2020	315,752
2021	500,000
2022	635,000
2023	760,000
Thereafter	550,000
Total debt principal payments	2,763,207
Mortgage loan premiums and deferred financing costs	(16,309)
Total debt	$ 2,746,898	$ 885,237

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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