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Stock Options, Restricted Stock and Restricted Stock Units (Details 2) - Employee Stock [Member] - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable, Number of shares 100,000
Exercisable, Weighted-average exercise price $ 51.95 $ 51.95 $ 51.95