Earnings Per Share (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
(in thousands)	2012		2011		2012		2011
Weighted-average number of shares of common stock for calculating basic earnings per share		24,765		24,340		24,702		24,299
Effect of potentially dilutive securities from equity-based compensation		384		402		437		401
Weighted-average number of shares of common stock for calculating diluted earnings per share		25,149		24,742		25,139		24,700

Securities not included in the computation of diluted earnings per share

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2012		2011		2012		2011
Options to purchase shares of common stock		1,049		1,280		1,034		1,288