Treasury Stock	3 Months Ended
Mar. 31, 2015
Treasury 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 expect to use the treasury stock to issue shares for stock option exercises, restricted stock grants and employee stock purchase plan stock purchases. In the first quarter of 2015, we withheld 16,401 shares of our common stock from employee vested restricted stock units in consideration for $1.4 million in payments for the employee's share award income tax withholding obligations.

Treasury Stock

3 Months Ended

Mar. 31, 2015

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 expect to use the treasury stock to issue shares for stock option exercises, restricted stock grants and employee stock purchase plan stock purchases.

In the first quarter of 2015, we withheld 16,401 shares of our common stock from employee vested restricted stock units in consideration for $1.4 million in payments for the employee's share award income tax withholding obligations.