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Financial Results by Quarter (Unaudited) Financial Results by Quarter (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Data [Abstract]                      
Revenues $ 203,499 $ 226,302 $ 215,581 $ 181,716 $ 217,250 $ 289,199 $ 268,233 $ 199,897 $ 827,098 $ 974,579 $ 678,595
Operating income 20,024 31,196 24,956 20,107 9,964 77,742 69,417 27,831 96,283 184,954 151,907
Net income $ 11,399 $ 20,565 $ 17,137 $ 6,560 $ 1,799 $ 60,336 $ 46,148 $ 14,597 $ 55,661 $ 122,880 $ 86,453
Net income per share:                      
Basic $ 0.17 [1] $ 0.30 [1] $ 0.25 [1] $ 0.10 [1] $ 0.03 [1] $ 0.96 [1] $ 0.73 [1] $ 0.29 [1] $ 0.82 [1] $ 2.03 [1] $ 2.12
Diluted $ 0.17 [1] $ 0.30 [1] $ 0.25 [1] $ 0.10 [1] $ 0.03 [1] $ 0.93 [1] $ 0.73 [1] $ 0.29 [1] $ 0.82 [1] $ 1.99 [1] $ 2.10
[1] Per share amounts are computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts may not equal the total computed for the year.