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Business Segments and Geographic Information (Geographic Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Geographical Information |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 599,430 | $ 583,530 | $ 583,509 | $ 564,917 | $ 568,977 | $ 566,759 | $ 577,070 | $ 550,614 | $ 2,331,386 | $ 2,263,420 | $ 2,179,490
Property and equipment, net | 2,158,610 |  |  |  | 2,078,123 |  |  |  | 2,158,610 | 2,078,123 | 1,897,241
U.S. operations |  |  |  |  |  |  |  |  |  |  |
Geographical Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,073,286 | 1,952,210 | 1,770,273
Property and equipment, net | 2,145,197 |  |  |  | 2,061,711 |  |  |  | 2,145,197 | 2,061,711 | 1,887,043
Australia operations |  |  |  |  |  |  |  |  |  |  |
Geographical Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 231,164 | 285,702 | 388,361
Property and equipment, net | 13,006 |  |  |  | 16,281 |  |  |  | 13,006 | 16,281 | 10,053
South African operations |  |  |  |  |  |  |  |  |  |  |
Geographical Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 19,806 | 18,251 | 13,658
Property and equipment, net | 88 |  |  |  | 131 |  |  |  | 88 | 131 | 145
United Kingdom operations |  |  |  |  |  |  |  |  |  |  |
Geographical Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 7,130 | 7,257 | 7,198
Property and equipment, net | $ 319 |  |  |  | $ 0 |  |  |  | $ 319 | $ 0 | $ 0

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