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New Accounting Standards ASU 2016-09 (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
New Accounting Pronouncement or Change in Accounting Principle, Description no material impact  
Retained Earnings [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative Effect from Adoption of new accounting for stock-based compensation $ 1.3 $ 1.3