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Segment Reporting - Geographic Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Geographic Information                      
Long-lived assets $ 4,565,535       $ 4,527,735       $ 4,565,535 $ 4,527,735  
Total revenue 506,048 $ 481,233 $ 465,076 $ 433,151 475,788 $ 460,046 $ 442,658 $ 431,974 1,885,508 1,810,466 $ 1,848,857
United States                      
Geographic Information                      
Long-lived assets 4,193,432       4,214,575       4,193,432 4,214,575  
Total revenue                 1,522,421 1,480,339 1,528,352
Canada and Mexico                      
Geographic Information                      
Long-lived assets 28,360       16,630       28,360 16,630  
Total revenue                 89,928 86,236 67,648
All other                      
Geographic Information                      
Long-lived assets $ 343,743       $ 296,530       343,743 296,530  
Total revenue                 $ 273,159 $ 243,891 $ 252,857