Earnings Per Share Table (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Income from continuing operations for calculating basic and diluted earnings per share	$ 20,264	$ 17,452
Income (loss) from discontinued operations	0	60
Net income	$ 20,264	$ 17,512
Weighted-average common shares for calculating basic earnings per share	29,313	29,580
Stock options, warrants and nonvested awards	642	773
Weighted-average common shares for calculating diluted earnings per share	29,955	30,353
Income from continuing operations (basic) (in dollars per share)	$ 0.69	$ 0.59
Income (loss) from discontinued operations (basic) (in dollars per share)	$ 0.00	$ 0.00
Net income per basic share (in dollars per share)	$ 0.69	$ 0.59
Income from continuing operations (diluted) (in dollars per share)	$ 0.68	$ 0.57
Income (loss) from discontinued operations (diluted) (in dollars per share)	$ 0.00	$ 0.01
Net income per diluted share (in dollars per share)	$ 0.68	$ 0.58

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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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