Earning Per Share (Details) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Numerator:
Net income (loss)	$ 2,067	$ (16,775)	$ 6,537	$ 4,862
Denominator:
Basic weighted-average shares outstanding	30,025,607	29,933,615	30,013,464	29,901,657
Effect of diluted securities	225,804		264,992	241,374
Diluted weighted-average shares outstanding	30,251,411	29,933,615	30,278,456	30,143,031
Earnings (loss) per share:
Basic	$ 0.07	$ (0.56)	$ 0.22	$ 0.16
Diluted	$ 0.07	$ (0.56)	$ 0.22	$ 0.16