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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Income tax expense $ 249 $ 205  
Goodwill, amortization period for tax purposes 15 years    
Gross deferred tax assets     $ 106,900
Accounting Standards Update 2016-09, Excess Tax Benefit Component      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Gross deferred tax assets $ 9,600    
Valuation allowance $ 9,600