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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]      
Deferred tax assets $ 20,000 $ 16,608  
Provisional discrete net benefit due to rate change 4,200    
Net deferred tax liability 20,076    
Unrecognized tax deductions, share-based compensation 16,000    
Potential affect of unrecognized tax benefits on effective tax rate 400    
Interest accrued on unrecognized tax benefits   400  
Income tax benefit, recognition of previously unrecognized tax benefits 1,100 $ 900 $ 2,500
Potential change in unrecognized tax benefits 200    
Federal      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards 24,000    
State      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards $ 257,000