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
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 10,621	$ 11,511
Weighted average number of shares:
Weighted average number of shares used in calculating basic net income/(loss) per share	31,786	31,496
Effect of dilutive stock-based compensation plans:
Stock options	106	113
Long-term incentive plan	159	173
Weighted average number of shares used in calculating diluted net income per share	32,051	31,782
Effect of stock-based compensation plans that were not included in the computation of diluted earnings per share because to do so would have been antidilutive
Average market price of common stock used for calculation of dilutive shares	$ 35.68	$ 26.41
Net income per share:
Basic	$ 0.33	$ 0.37
Diluted	$ 0.33	$ 0.36