Shareholders' Equity

9 Months Ended

Sep. 30, 2018

7. Shareholders’ Equity

Through September 30, 2018, we had announced authorizations by our Board of Directors of repurchases of shares of common stock, which in the aggregate, authorized expenditures of up to $2.5 billion. Under the remaining repurchase authorizations, shares may be purchased from time to time in open market transactions, subject to market conditions.

The following table summarizes common stock repurchases under authorized programs:



	Three months ended				Nine months ended
	September 30,				September 30,
	2018		2017		2018		2017
Shares of common stock repurchased		40		301		334		545
Total cost of common stock repurchased	$	18,885	$	102,511	$	115,300	$	207,159

As of September 30, 2018, $102,984 was available to repurchase shares under the announced repurchase authorizations. Shares repurchased are being held in treasury stock until they are reissued or retired at the discretion of the Board of Directors.

During the nine months ended September 30, 2018, 14 shares of common stock at a total cost of $4,627 were netted and surrendered as payment for minimum statutory withholding obligations in connection with the vesting of outstanding stock awards. Shares surrendered by the participants in accordance with the applicable award agreements and plan are deemed repurchased by us but are not part of publicly announced share repurchase programs.