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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Basic weighted-average number of shares 23,450 22,791
Effect of dilutive securities:    
Stock options 6 41
Non-vested restricted Class B common stock 305 852
Diluted weighted-average number of shares 23,761 23,684