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Quarterly Operating Results (Unaudited) (Details) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Data [Abstract]                      
Total revenue $ 207,037 $ 223,486 $ 243,272 $ 196,210 $ 206,621 $ 220,239 $ 256,664 $ 213,034 $ 870,005 $ 896,558 $ 930,990
Total operating expenses 171,519 189,168 192,621 176,914 172,870 178,936 198,559 188,723 730,222 739,088 785,716
Operating income 35,518 34,318 50,651 19,296 33,751 41,303 58,105 24,311 139,783 157,470 145,274
Net income $ 24,772 $ 21,623 $ 36,595 $ 8,887 $ 23,906 $ 29,937 $ 44,175 $ 16,778 $ 91,877 $ 114,796 $ 85,630
Basic earnings per share (in dollars per share) $ 0.12 $ 0.11 $ 0.18 $ 0.04 $ 0.12 $ 0.15 $ 0.22 $ 0.08 $ 0.46 $ 0.57 $ 0.43
Diluted earnings per share (in dollars per share) $ 0.12 $ 0.11 $ 0.18 $ 0.04 $ 0.12 $ 0.15 $ 0.22 $ 0.08 $ 0.46 $ 0.57 $ 0.43