Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation (Details 1)

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Stock Based Compensation (Details 1) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Summary of stock based compensation agreements    
Unrecognized stock-based compensation cost $ 14,391 $ 9,058
Weighted average years remaining vesting period 2 years 6 months 15 days 2 years 18 days
Total equity awards outstanding 1,823,417 1,738,533