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Quarterly Operating Results (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Data [Abstract]                      
Total revenue $ 206,621 $ 220,239 $ 256,664 $ 213,034 $ 233,799 $ 238,502 $ 249,801 $ 208,888 $ 896,558 $ 930,990 $ 872,862
Total operating expenses 172,870 178,936 198,559 188,723 195,511 197,086 205,637 187,482 739,088 785,716 735,395
Operating income 33,751 41,303 58,105 24,311 38,288 41,416 44,164 21,406 157,470 145,274 137,467
Net income $ 23,906 $ 29,937 $ 44,175 $ 16,778 $ 25,703 $ 24,464 $ 24,822 $ 10,641 $ 114,796 $ 85,630 $ 163,377
Basic earnings per share (in dollars per share) $ 0.12 $ 0.15 $ 0.22 $ 0.08 $ 0.14 $ 0.12 $ 0.12 $ 0.05 $ 0.57 $ 0.43 $ 0.83
Diluted earnings per share (in dollars per share) $ 0.12 $ 0.15 $ 0.22 $ 0.08 $ 0.14 $ 0.12 $ 0.12 $ 0.05 $ 0.57 $ 0.43 $ 0.83