Earnings Per Share (Schedule Computing Earnings Per Share and Weighted Average Number of Shares) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income/(loss) attributable to the Company	$ (2,172)	$ 11,219	$ 10,041	$ 21,840
Weighted average number of shares:
Weighted average number of shares used in calculating basic net income per share	31,999	31,832	31,941	31,809
Effect of dilutive stock-based compensation plans:
Stock options		103	74	104
Weighted average number of shares used in calculating diluted net income per share	31,999	31,935	32,015	31,913
Shares related to stock-based compensation plans that were not included in the computation of diluted earnings per share because to do so would be antidilutive	56
Average market price of common stock used for calculation of dilutive shares	$ 40.12	$ 36.23	$ 38.76	$ 35.97
Earnings per share attributable to Company shareholders:
Basic	(0.07)	0.35	0.31	0.69
Diluted	$ (0.07)	$ 0.35	$ 0.31	$ 0.68