Earnings Per Share (Computation of Basic and Diluted) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Numerator:
Income from continuing operations	$ 10,902	$ 5,583	$ 25,482	$ 12,560
Denominator:
Denominator for basic earnings per share - Weighted-average shares (shares)	18,158,244	17,107,727	18,054,543	17,090,093
Effect of dilutive stock options (shares)	531,000	491,000	564,000	546,000
Denominator for diluted earnings per share - Adjusted weighted-average shares and assumed conversions (shares)	18,688,538	17,599,481	18,618,998	17,636,440
Basic income from continuing operations per share (in dollars per share)	$ 0.60	$ 0.33	$ 1.41	$ 0.73
Diluted income from continuing operations per share (in dollars per share)	$ 0.58	$ 0.32	$ 1.37	$ 0.71