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Earnings per Share (Detail Textuals) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Aug. 06, 2015
Mar. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   42,738 84,830
Share repurchase plan, Authorized amount $ 2    
Number of common stock repurchased 8,635 8,635 2,155
Average price per share of common stock repurchased $ 14.94