Shareholders' Equity

6 Months Ended

Jun. 30, 2018

8. Shareholders’ Equity

Through June 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 June 30,				Six months ended June 30,
	2018		2017		2018		2017
Shares of common stock repurchased		75		103		294		244
Total cost of common stock repurchased	$	28,377	$	46,689	$	96,415	$	104,648

As of June 30, 2018, $121,868 was available to repurchase shares under the announced repurchase authorizations. Shares repurchased are being held in treasury stock until such time as they are reissued or retired at the discretion of the Board of Directors.

During the six months ended June 30, 2018, 13 shares of common stock at a total cost of $4,285 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.