Weighted Average Shares Outstanding

12 Months Ended

Dec. 31, 2011

Weighted Average Number of Shares Outstanding Reconciliation [Abstract]

Weighted Average Shares Outstanding

Weighted Average Shares Outstanding

A reconciliation of the weighted average shares outstanding used in calculating basic and diluted net income (loss) per share in the accompanying consolidated statements of operations is as follows (in thousands):

Years Ended December 31,	2011	2010	2009
Weighted average shares outstanding:
Weighted average common stock outstanding	38,677	38,750	38,584
Less: weighted average unvested restricted stock outstanding	560	930	1,018
Total basic weighted average shares outstanding	38,117	37,820	37,566
Diluted weighted average shares outstanding:
Weighted average common stock outstanding, basic	38,117	37,820	37,566
Effect of dilutive securities:
Common stock options and restricted stock units1	356	—	117
Total weighted average shares outstanding assuming dilution	38,473	37,820	37,683

¹Due to the net loss for the year ended December 31, 2010, common stock options and restricted stock units representing 161,000 shares have been excluded from the number of shares used in calculating diluted loss per share for that period, as their inclusion would be antidilutive.