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Share Based Compensation (Details)	6 Months Ended
Share Based Compensation (Details)	Jun. 30, 2012
Summary of option activity under our stock compensation plans
Outstanding at December 31, 2011	4,053,652
Granted	1,000
Exercised
Forfeited	(64,198)
Expired	(325,253)
Outstanding at June 30, 2012	3,665,201
Exercisable at June 30, 2012	3,121,084

- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References+ Details

- Definition

Number of share options (or share units) exercised during the current period.

+ References+ Details