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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
 [1]
Sep. 30, 2017
 [1]
Jun. 30, 2017
 [1]
Mar. 31, 2017
 [1]
Dec. 31, 2018
Dec. 31, 2017
 [1],[3]
Dec. 31, 2016
 [3]
Selected Quarterly Financial Information [Abstract]                      
Revenue $ 134,917 $ 40,751 $ 32,657 $ 43,070 $ 83,118 $ 31,466 $ 34,566 $ 41,556 $ 251,395 $ 190,706 [2] $ 193,324 [2]
Income (loss) from operations 41,645 (15,454) (16,920) (6,720) 20,802 (15,673) (10,468) (4,113) 2,551 (9,452) 2,823
Net income (loss) $ 26,072 $ (8,972) $ (12,014) $ (4,845) $ 28,028 $ (2,176) $ (1,506) $ 1,080 $ 241 [4] $ 25,426 [4],[5] $ 304 [4],[5]
Net income (loss) per share:                      
Net Income per share - basic (in usd per share) $ 1.32 [6] $ (0.47) [6] $ (0.63) [6] $ (0.26) [6] $ 1.50 [6] $ (0.12) [6] $ (0.08) [6] $ 0.06 [6] $ 0.01 [6] $ 1.37 [6] $ 0.02
Diluted (in usd per share) $ 1.25 [6] $ (0.47) [6] $ (0.63) [6] $ (0.26) [6] $ 1.47 [6] $ (0.12) [6] $ (0.08) [6] $ 0.06 [6] $ 0.01 [6] $ 1.33 [6] $ 0.02
[1] As adjusted for the adoption of ASC 606 using the full retrospective method
[2] As adjusted for the adoption of ASC 606 using the full retrospective method
[3] As adjusted for the adoption of ASC 606 using the full retrospective method.
[4] Balances and the years ended December 31, 2016 and 2017 have been adjusted for the adoption of ASC 606 using the full retrospective method.
[5] As adjusted for the adoption of ASC 606 using the full retrospective method.
[6] Computed using weighted-average share amounts outstanding for the respective periods presented