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Earnings Per Share and Stockholders' Equity (Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share) (Details) - Stock Options [Member] - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of shares 1,054,091 1,061,541 1,215,450
Minimum [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Range of exercise prices $ 24.79 $ 24.79 $ 24.79
Maximum [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Range of exercise prices $ 24.79 $ 24.79 $ 24.79