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Quarterly Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  | $ 47,400 |
Total revenues | $ 404,597 | $ 432,167 | $ 419,447 | $ 404,298 | $ 393,020 | $ 421,418 | $ 397,764 | $ 363,594 | $ 1,660,509 | 1,575,796 | $ 1,363,279
Operating Expenses | 309,560 | 319,337 | 318,533 | 310,520 | 354,574 | 308,733 | 295,983 | 276,757 | 1,257,950 | 1,236,047 | 1,005,670
Income before income taxes | 95,037 | 112,830 | 100,914 | 93,778 | 38,446 | 112,685 | 101,781 | 86,837 | 402,559 | 339,749 | 357,609
Net Income (Loss) Attributable to Parent | $ 57,935 | $ 67,427 | $ 61,005 | $ 56,951 | $ 24,395 | $ 68,331 | $ 61,755 | $ 52,415 | $ 243,318 | $ 206,896 | $ 217,112
Earnings Per Share, Basic | $ 0.0041 | $ 0.0048 | $ 0.0043 | $ 0.0040 | $ 0.0017 | $ 0.0047 | $ 0.0043 | $ 0.0036 | $ 1.72 | $ 1.43 | $ 1.50
Diluted (in dollars per share) | $ 0.0041 | $ 0.0047 | $ 0.0043 | $ 0.0039 | $ 0.0017 | $ 0.0047 | $ 0.0042 | $ 0.0036 | $ 1.70 | $ 1.41 | $ 1.48

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