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Subsequent Events - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended
Jul. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Subsequent Event [Line Items]      
Long-term debt   $ 4,172,353 $ 4,230,845
Subsequent Event      
Subsequent Event [Line Items]      
Proceeds from sale of real estate $ 18,000    
Unsecured Term Loan | Subsequent Event      
Subsequent Event [Line Items]      
Extinguishment of debt 190,000    
Long-term debt $ 490,000