Income Taxes - Additional Information (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Apr. 12, 2016 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Income Tax Disclosure [Abstract] | |||||
| Income tax expense (benefit) | $ (32) | $ 13 | $ 48 | $ 45 | |
| Gain on disposals | 39,149 | 3,105 | |||
| Uncertain income tax positions | $ 0 | $ 0 | |||
| Other income, net | Sold | Cracked | |||||
| Income Tax Disclosure [Abstract] | |||||
| Gain on disposals | $ 38,100 | ||||