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Stock-Based Compensation (Restricted Stock Activity) (Details) - Restricted Stock
shares in Thousands
3 Months Ended
Mar. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Beginning balance | shares 1,479
Granted | shares 525
Canceled | shares (40)
Vested | shares (34)
Ending balance | shares 1,930
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Beginning Balance (USD per share) | $ / shares $ 15.58
Granted (USD per share) | $ / shares 12.15
Canceled (USD per share) | $ / shares 16.22
Vested (USD per share) | $ / shares 16.22
Ending Balance (USD per share) | $ / shares $ 14.62