Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt	$ 3,572,572	$ 3,640,180
Less current portion	267,153	294,426
Total long-term debt, less current portion	3,305,419	3,345,754
Mortgage notes payable
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt	3,504,957	3,579,931
Unamortized debt discount	$ 17,400	$ 18,600
Weighted average interest rate	4.88%	4.75%
Other notes payable
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt	$ 67,615	$ 60,249
Weighted average interest rate	5.58%	5.85%