Earnings Per Share (Computation of Basic and Diluted) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator:
Income from continuing operations	$ 14,580	$ 6,976
Denominator:
Denominator for basic earnings per share - Weighted-average shares (shares)	17,950,843	17,072,459
Effect of dilutive stock options (shares)	598,000	601,000
Denominator for diluted earnings per share - Adjusted weighted-average shares and assumed conversions (shares)	18,549,458	17,673,399
Basic income from continuing operations per share (in dollars per share)	$ 0.81	$ 0.41
Diluted income from continuing operations per share (in dollars per share)	$ 0.79	$ 0.39