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Impact of Recently Issued Accounting Standards - Narrative (Details) - Accounting Standards Update 2016-09 [Member]
$ in Thousands
Dec. 31, 2016
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Reversal of deferred tax asset $ 1,100
Valuation allowance, adjustment (1,100)
Retained Earnings [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect 312
Additional Paid-in Capital [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect $ (312)