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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 12, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]          
Income tax expense (benefit)   $ 69 $ 10 $ 80 $ 32
Gain on disposals       39,149 2,908
Uncertain income tax positions       $ 0 $ 0
Other income, net | Sold | Cracked          
Income Tax Disclosure [Abstract]          
Gain on disposals $ 38,100