Treasury Stock	12 Months Ended
Dec. 31, 2014
Treasruy Stock [Abstract]
Treasury Stock [Text Block]	Treasury Stock In July 2010, our Board of Directors approved a common stock purchase plan to purchase up to $40.0 million of our common stock. This plan has no expiration date and we have $22.5 million remaining on this purchase plan. We purchased $5.6 million of our common stock in the year ended December 31, 2014. We did not purchase any of our common stock in the year ended December 31, 2013. We expect to use the treasury stock to issue shares for stock option exercises, restricted stock grants and employee stock purchase plan stock purchases. In 2014, we withheld 4,232 shares of our common stock from employee vested restricted stock units in consideration for $0.2 million in payments for the employee's share award income tax withholding obligations. In 2014, we also withheld 4,583 shares of our common stock from option exercises with shares remitted back to us in lieu of $0.3 million in cash payments for the option exercises. In 2013, we withheld 43,188 shares of our common stock from employee option exercises and vested restricted stock units in consideration for $3.0 million in payments for the employee's share award income tax withholding obligations. In 2013, we also withheld 96,927 shares of our common stock from option exercises with shares remitted back to us in lieu of a cash payment for the option exercise.

Treasury Stock

In July 2010, our Board of Directors approved a common stock purchase plan to purchase up to $40.0 million of our common stock. This plan has no expiration date and we have $22.5 million remaining on this purchase plan. We purchased $5.6 million of our common stock in the year ended December 31, 2014. We did not purchase any of our common stock in the year ended December 31, 2013. We expect to use the treasury stock to issue shares for stock option exercises, restricted stock grants and employee stock purchase plan stock purchases.

In 2014, we withheld 4,232 shares of our common stock from employee vested restricted stock units in consideration for $0.2 million in payments for the employee's share award income tax withholding obligations. In 2014, we also withheld 4,583 shares of our common stock from option exercises with shares remitted back to us in lieu of $0.3 million in cash payments for the option exercises.

In 2013, we withheld 43,188 shares of our common stock from employee option exercises and vested restricted stock units in consideration for $3.0 million in payments for the employee's share award income tax withholding obligations. In 2013, we also withheld 96,927 shares of our common stock from option exercises with shares remitted back to us in lieu of a cash payment for the option exercise.