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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]                              
Net income attributable to the Company                         $ 132,398 $ 82,891 $ 33,111
Weighted average number of shares:                              
Weighted average number of shares used in calculating basic net income per share                         32,296 32,252 32,169
Effect of dilutive stock-based compensation plans:                              
Stock options                         12 15 30
Long-term incentive plan                         14 28 45
Weighted average number of shares used in calculating diluted net income per share                         32,322 32,295 32,244
Average market price of common stock used for calculation of dilutive shares                         $ 78.13 $ 66.95 $ 52.19
Net income per share:                              
Basic $ 0.91 $ 1.24 $ 1.05 $ 0.90 $ 0.54 $ 0.86 $ 0.93 $ 0.24 $ 0.19 $ 0.47 $ 0.03 $ 0.34 4.10 2.57 1.03
Diluted $ 0.91 $ 1.24 $ 1.05 $ 0.90 $ 0.54 $ 0.86 $ 0.93 $ 0.24 $ 0.19 $ 0.47 $ 0.03 $ 0.34 $ 4.10 $ 2.57 $ 1.03
Common Stock, shares outstanding 32,300       32,300       32,200       32,300 32,300 32,200