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Earnings Per Share (Summary of Antidilutive Securities) (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock Options        
Incremental shares from stock options and restricted stock:        
Antidilutive securities (in shares) 1,854 2,068 1,813 2,161
Restricted Stock        
Incremental shares from stock options and restricted stock:        
Antidilutive securities (in shares) 464 582 427 591
Performance Based Shares        
Incremental shares from stock options and restricted stock:        
Antidilutive securities (in shares) 530 409 467 334