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Stock-Based Compensation (Restricted Stock Unit Activity) (Details) - Restricted Stock
shares in Thousands
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Summary of restricted stock activity  
Outstanding Shares, Beginning | shares 1,013
Restricted Stock, Granted | shares 314
Vested | shares (344)
Forfeited | shares (84)
Outstanding Shares, Ending | shares 899
Weighted Average Grant Date Fair Value / Share  
Weighted Average Grant Date Fair Value, Outstanding at January 1, 2016 | $ / shares $ 34.52
Weighted Average Grant Date Fair Value, Granted | $ / shares 39.63
Weighted Average Grant Date Fair Value, Vested | $ / shares 30.63
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 36.81
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2016 | $ / shares $ 37.67