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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Income tax expense $ 368 $ 150 $ 617 $ 355    
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   $ 9,600