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Quarterly Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 474,316 | $ 475,646 | $ 466,305 | $ 465,080 | $ 433,664 | $ 462,274 | $ 446,518 | $ 424,173 | $ 1,881,347 | $ 1,766,629 | $ 1,660,509
Operating Expenses | 367,982 | 351,227 | 358,303 | 354,113 | 338,763 | 345,302 | 337,441 | 321,624 | 1,431,625 | 1,343,130 | 1,257,950
Income before income taxes | 106,334 | 124,419 | 108,002 | 110,967 | 94,901 | 116,972 | 109,077 | 102,549 | 449,722 | 423,499 | 402,559
Net Income (Loss) Attributable to Parent | $ 187,505 | $ 75,913 | $ 66,102 | $ 70,110 | $ 57,626 | $ 71,545 | $ 66,250 | $ 62,070 | $ 399,630 | $ 257,491 | $ 243,318
Earnings Per Share, Basic | $ 0.0135 | $ 0.0054 | $ 0.0047 | $ 0.0050 | $ 0.0041 | $ 0.0051 | $ 0.0047 | $ 0.0045 | $ 2.86 | $ 1.84 | $ 1.72
Diluted (in dollars per share) | $ 0.0132 | $ 0.0053 | $ 0.0046 | $ 0.0049 | $ 0.0041 | $ 0.0050 | $ 0.0047 | $ 0.0044 | $ 2.81 | $ 1.82 | $ 1.70

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