Earnings Per Share (Schedule Computing Earnings Per Share and Weighted Average Number of Shares) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 11,812	$ 4,698	$ 33,652	$ 8,830
Weighted average number of shares:
Weighted average number of shares used in calculating basic net income per share	31,848	31,719	31,822	31,615
Effect of dilutive stock-based compensation plans:
Stock options	98	122	102	129
Weighted average number of shares used in calculating diluted net income per share	31,946	31,841	31,924	31,744
Average market price of common stock used for calculation of dilutive shares	$ 37.20	$ 34.43	$ 36.38	$ 30.53
Net income per share:
Basic	$ 0.37	$ 0.15	$ 1.06	$ 0.28
Diluted	$ 0.37	$ 0.15	$ 1.05	$ 0.28