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Stock-Based Compensation - Equity Compensation Plans Narrative (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reserved shares of common stock for possible future issuance   3,700
Employee stock options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options issued (in shares) 46  
2004 Equity Compensation Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized for issuance   4,100