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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]      
Alternative minimum tax credit $ 0 $ 2,438  
Additions based on tax positions related to prior years 0 44  
Provision for income taxes 9,793 $ 6,917 $ 2,582
Remeasurement resulting from Tax Act 3,535    
Excess tax benefit from exercise of stock options and vesting of restricted shares 853    
California      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 8,850    
Federal      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 8,527