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Stock-Based Payments (Restricted Stock Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Number of shares outstanding at December 31 (shares) 1,922,298  
Number of shares granted 811,436  
Number of shares vested (569,892)  
Number of shares cancelled (343,264)  
Number of shares outstanding at December 31 (shares) 1,820,578  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Weighted average grant date fair value outstanding $ 98 $ 83
Weighted average grant date fair value granted 105  
Weighted average grant date fair value vested 72  
Weighted average grant date fair value cancelled $ 73