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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income attributable to the Company $ 10,839 $ 13,501
Weighted average number of shares:    
Weighted average number of shares used in calculating basic net income per share 32,128 32,041
Effect of dilutive stock-based compensation plans:    
Stock options 36 40
Weighted average number of shares used in calculating diluted net income per share 32,164 32,081
Average market price of common stock used for calculation of dilutive shares $ 46.49 $ 35.23
Net income per share:    
Basic 0.34 0.42
Diluted $ 0.34 $ 0.42