Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Weighted-average number of shares of common stock used to calculate basic and diluted earnings per share

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2012		2011		2012		2011
Weighted-average number of shares of common stock for calculating basic earnings per share		24,785		24,362		24,730		24,320
Effect of potentially dilutive securities from equity-based compensation		321		357		403		382
Weighted-average number of shares of common stock for calculating diluted earnings per share		25,106		24,719		25,133		24,702

Securities not included in the computation of diluted earnings per share

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2012		2011		2012		2011
Options to purchase shares of common stock		1,203		1,175		1,049		1,168