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Income Taxes - Income Tax Benefit (Expense) from Continuing Operations (Details) - USD ($) $ 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
Current portion of income tax expense: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
State |  |  |  |  |  |  |  |  | 458 | 20 | 296
Current portion of income tax expense |  |  |  |  |  |  |  |  | 458 | 20 | 296
Deferred portion of income tax (benefit) expense: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (61,396) | 0 | 0
State |  |  |  |  |  |  |  |  | 0 | 0 | 0
Deferred portion of income tax (benefit) expense |  |  |  |  |  |  |  |  | (61,396) | 0 | 0
Total income tax (benefit) expense | $ (61,673) | $ 583 | $ 99 | $ 53 | $ (131) | $ 44 | $ 63 | $ 44 | $ (60,938) | $ 20 | $ 296
Effective tax rate |  |  |  |  |  |  |  |  | (166.00%) | 0.00% | 18.00%

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