Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Earnings Per Share [Abstract]
Net income attributable to the Company													$ 17,517	$ 30,977		$ 34,938
Weighted average number of shares used in calculating basic net income/(loss) per share													31,649,000	31,356,000		31,262,000
Stock options													129,000	57,000		104,000
Long-term incentive plan													156,000	223,000		144,000
Weighted average number of shares used in calculating diluted net income per share													31,934,000	31,636,000		31,510,000
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													$ 31.85	$ 21.51		$ 23.44
Basic	$ 0.27	$ 0.15	$ (0.23)	$ 0.36	$ 0.27	$ 0.30	$ (1.08)	$ 1.50	$ (0.23)	$ 0.53	$ 0.28	$ 0.54	$ 0.55	$ 0.99		$ 1.12
Diluted	$ 0.27	$ 0.15	$ (0.23)	$ 0.36	$ 0.26	$ 0.30	$ (1.08)	$ 1.49	$ (0.23)	$ 0.53	$ 0.28	$ 0.53	$ 0.55	$ 0.97	[1]	$ 1.11
Common Stock, shares outstanding	31,800,000				31,400,000				31,300,000				31,800,000	31,400,000		31,300,000

[1] Due to a loss from continuing operations in 2012, the calculation of diluted income per share cannot be calculated by dividing net income by the diluted shares in the table above. See Statement of Income.