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Quarterly Financial Results (unaudited) - Summary (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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 Information Disclosure [Abstract]                      
Revenues $ 3,604 $ 15,710 $ 8,951 $ 22,357 $ 13,202 $ 12,885 $ 14,895 $ 21,757 $ 50,622 $ 62,739 $ 16,923
Cost of revenues, exclusive of operating expenses shown below 3,478 13,259 5,769 17,311 7,224 10,610 14,003 15,715      
Other operating expenses 5,388 5,364 7,794 8,357 13,113 12,264 18,670 12,940      
Operating loss (5,262) (2,913) (4,612) (3,311) (7,135) (9,989) (17,778) (6,898) (16,098) (41,800) (41,814)
Earnings from equity method investments 15,518 10,735 13,754 5,577 3,788 (41) 4,860 314 45,584 8,921 42,712
Royalties, related party 2,203 2,064 669 1,189 2,876 3,273 2,299 2,194 6,125 10,642 6,410
Other income (expenses), net 1,698 309 (1,852) 974 (2,568) (1,853) (1,765) (1,698)      
Income (loss) before income tax expense 14,157 10,195 7,959 4,429 (3,039) (8,610) (12,384) (6,088) 36,740 (30,121) 1,683
Income tax (benefit) expense (61,673) 583 99 53 (131) 44 63 44 (60,938) 20 296
Net income (loss) $ 75,830 $ 9,612 $ 7,860 $ 4,376 $ (2,908) $ (8,654) $ (12,447) $ (6,132) $ 97,678 $ (30,141) $ 1,387
Net income (loss) per common share – basic (in dollars per share) $ 3.45 $ 0.44 $ 0.36 $ 0.20 $ (0.13) $ (0.40) $ (0.57) $ (0.28) $ 4.40 $ (1.37) $ 0.06
Net income (loss) per common share – diluted (in dollars per share) $ 3.39 $ 0.43 $ 0.35 $ 0.20 $ (0.13) $ (0.40) $ (0.57) $ (0.28) $ 4.34 $ (1.37) $ 0.06
Weighted-average number of common shares outstanding:                      
Basic (in shares) 21,693 21,740 21,875 21,849 21,676 21,687 21,715 21,696 21,931 21,773 21,554
Diluted (in shares) 22,061 22,098 22,187 22,177 21,676 21,687 21,715 21,696 22,234 21,773 22,079
Reduction to royalty award accrual $ 4,000               $ 4,000    
Valuation allowance adjustments $ (61,400)