Earnings Per Share Table (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Income from continuing operations for calculating basic and diluted earnings per share	$ 15,663	$ 16,333	$ 35,927	$ 33,785
Income from discontinued operations	0	16	0	76
Net income	$ 15,663	$ 16,349	$ 35,927	$ 33,861
Weighted-average common shares for calculating basic earnings per share	29,167	28,658	29,240	29,119
Stock options, warrants and nonvested awards	436	746	539	759
Weighted-average common shares for calculating diluted earnings per share	29,603	29,404	29,779	29,878
Income from continuing operations (basic) (in dollars per share)	$ 0.54	$ 0.57	$ 1.23	$ 1.16
Income from discontinued operations (basic) (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Net income per basic share (in dollars per share)	$ 0.54	$ 0.57	$ 1.23	$ 1.16
Income from continuing operations (diluted) (in dollars per share)	$ 0.53	$ 0.56	$ 1.21	$ 1.13
Income from discontinued operations (diluted) (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Net income per diluted share (in dollars per share)	$ 0.53	$ 0.56	$ 1.21	$ 1.13

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