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Earnings per Share (Detail Textuals)
6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Earnings Per Share [Abstract]      
Special stock dividend, payment date Jul. 01, 2017    
Special stock dividend, rate percent 4.00% 4.00% 4.00%
Special stock dividend, record date Jul. 15, 2017