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Stockholders' Equity (Notes)
6 Months Ended
Jun. 30, 2017
Stockholders' Equity Attributable to Parent [Abstract]  
Stockholders' Equity Note Disclosure [Text Block]
Stockholders' Equity

Common Stock

On February 3, 2017, we acquired the HIS business from Pfizer and as partial consideration, we issued 3.2 million unregistered shares of our common stock to Pfizer. The fair value of the common stock was determined based on the closing price of our common shares on the issuance date, discounted to reflect a contractual lock-up period, whereby Pfizer is prohibited from the transfer of the shares, subject to certain exceptions, until the earlier of (i) the expiration of Pfizer’s services to us in the related transitional services agreement (see Note 17: Collaborative and Other Arrangements) or (ii) eighteen months.

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. During the three and six months ended June 30, 2017, we did not purchase any shares of our common stock under the stock purchase plan. As of June 30, 2017, the remaining authorized amount under this purchase plan is approximately $7.2 million. We are currently limited on share purchases in accordance with the terms and conditions of our Senior Note with Pfizer, (see Note 14: Long-Term Obligations). 

For the six months ended June 30, 2017, we withheld 25,864 shares of our common stock from employee vested restricted stock units in consideration for $3.7 million in payments made on the employee's behalf for their minimum statutory income tax withholding obligations. Treasury stock is used to issue shares for stock option exercises, restricted stock grants and employee stock purchase plan stock purchases.