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Quarterly Operating Results (Unaudited) (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 Data [Abstract]                      
Total revenue $ 233,799 $ 238,502 $ 249,801 $ 208,888 $ 223,627 $ 229,217 $ 229,934 $ 190,084 $ 930,990 $ 872,862 $ 799,688
Total operating expenses 195,511 197,086 205,637 187,482 189,431 191,045 174,897 180,022 785,716 735,395 724,530
Operating income 38,288 41,416 44,164 21,406 34,196 38,172 55,037 10,062 145,274 137,467 75,158
Net income $ 25,703 $ 24,464 $ 24,822 $ 10,641 $ 63,616 $ 43,808 $ 51,916 $ 4,037 $ 85,630 $ 163,377 $ 49,065
Basic earnings per share (in dollars per share) $ 0.14 $ 0.12 $ 0.12 $ 0.05 $ 0.32 $ 0.22 $ 0.27 $ 0.02 $ 0.43 $ 0.83 $ 0.25
Diluted earnings per share (in dollars per share) $ 0.14 $ 0.12 $ 0.12 $ 0.05 $ 0.32 $ 0.22 $ 0.26 $ 0.02 $ 0.43 $ 0.83 $ 0.25