Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt	$ 3,642,997	$ 3,640,180
Less current portion	454,854	294,426
Total long-term debt, less current portion	3,188,143	3,345,754
Mortgage notes payable
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt	3,566,621	3,579,931
Unamortized debt discount	$ 18,000	$ 18,600
Weighted average interest rate	4.93%	4.75%
Other notes payable
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt	$ 76,376	$ 60,249
Weighted average interest rate	5.42%	5.85%