Earnings Per Share (Notes)

6 Months Ended

Jun. 30, 2016

Basic earnings per share are computed based on the weighted average number of common shares outstanding during the period. Diluted earnings per share are computed using the weighted average number of common shares outstanding and the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Potential common shares consist of: i) unvested employee stock purchase plan shares and ii) contingently issuable time-based and performance-based restricted stock units, along with associated dividend equivalent rights. Unvested performance-based restricted stock units and associated dividend equivalent rights are included in dilutive potential common shares only after the performance criteria have been met.

For the three and six month periods ended June 30, 2016, unvested performance-based restricted stock units and related dividend equivalent rights of approximately 305,000 were excluded from the dilutive calculation because the performance goals had not been met, with 306,000 excluded for the three and six month periods ended June 30, 2015.

Net income is the same for both the basic and diluted earnings per share computations. The reconciliations of the denominators of the basic and diluted earnings per share computations are as follows (in thousands):



	Three Months Ended June 30,		Six Months Ended June 30,
	2016	2015	2016	2015
Weighted-average common shares outstanding—basic	88,902	80,745	88,867	79,515
Dilutive effect of potential common shares	—	—	—	—
Weighted-average common shares outstanding—diluted	88,902	80,745	88,867	79,515