Common Stock and Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Details of earnings per share calculations
Net income- continuing operations	$ 7,398	$ 3,339	$ 9,392	$ 6,986
Net (loss) - discontinued operations	(236)	(718)	(319)	(1,865)
Net income	$ 7,162	$ 2,621	$ 9,073	$ 5,121
Weighted average common shares outstanding:
Basic	38,065	37,532	37,928	37,526
Incremental shares with dilutive effect:
Stock options			530	910
Diluted	38,742	38,752	38,597	38,611
Basic income (loss) per share
Continuing operations	$ 0.19	$ 0.09	$ 0.25	$ 0.19
Discontinued operations	$ (0.01)	$ (0.02)	$ (0.01)	$ (0.05)
Total net income per share	$ 0.18	$ 0.07	$ 0.24	$ 0.14
Diluted income (loss) per share
Continuing operations	$ 0.19	$ 0.09	$ 0.24	$ 0.18
Discontinued operations	$ (0.01)	$ (0.02)	$ (0.01)	$ (0.05)
Total net income per share	$ 0.18	$ 0.07	$ 0.23	$ 0.13
Stock Options [Member]
Incremental shares with dilutive effect:
Stock options	524	950
Restricted Stock [Member]
Incremental shares with dilutive effect:
Stock options	153	270

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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