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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 4,698	$ 9,463	$ 8,830	$ 22,759
Weighted average number of shares used in calculating basic net income/(loss) per share	31,719	31,363	31,615	31,340
Stock options	122	35	129	58
Long-term incentive plan	169	152	169	152
Weighted average number of shares used in calculating diluted net income/(loss) per share	32,010	31,550	31,913	31,550
Average market price of common stock used for calculation of dilutive shares	$ 34.43	$ 19.92	$ 30.53	$ 21.46
Basic	$ 0.15	$ 0.30	$ 0.28	$ 0.73
Diluted	$ 0.15	$ 0.30	$ 0.28	$ 0.72