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Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Computed expected tax provision $ 14,334 $ 28,233 $ 32,371
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount (70,055) 0 0
State and local taxes, net of federal income tax impact (1,201) 3,046 3,753
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount 3,158 2,850 (3,593)
Effective Income Tax Rate Reconciliation, Adjustment for New York State Attribute True Up, Amount 2,207 0 0
Other 1,488 2,683 (3,212)
Income tax provision $ (56,385) $ 31,112 $ 36,505