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Income Taxes - Provision for income taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current tax expense: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 1,010 |  | $ 250
State and local |  |  |  |  |  |  |  |  | 1,485 |  | 57
Total current tax expense |  |  |  |  |  |  |  |  | 2,495 |  | 307
Deferred tax expense: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 13,554 | $ 478 | 4,929
State and local |  |  |  |  |  |  |  |  | 686 | 136 | 656
Remeasurement of net deferred tax assets |  |  |  |  |  |  |  |  | 2,364 |  |
Total deferred tax expense before reversal of valuation allowance |  |  |  |  |  |  |  |  | 16,604 | 614 | 5,585
Deferred tax valuation allowance |  |  |  |  |  |  |  |  |  | (61,859) | (5,585)
Provision (benefit) for income taxes | $ 11,851 | $ (1,390) | $ 4,094 | $ 4,544 | $ (61,023) | $ 9 | $ 9 | $ (240) | $ 19,099 | $ (61,245) | $ 307

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