Weighted Average Shares Outstanding

Income from continuing operations and net income per common share is computed in accordance with accounting standards related to earnings per share. Basic earnings per share is calculated using the weighted-average number of common shares outstanding during the year. Share-based payment awards that entitle their holders to receive nonforfeitable dividends before vesting should be considered participating securities and, as such, should be included in the calculation of basic earnings per share. The Company’s restricted stock unit awards which contain nonforfeitable rights to dividends are considered participating securities. Diluted earnings per share reflects the assumed exercise and conversion of all dilutive securities. Shares held by the Retirement Savings Plan are considered outstanding for both basic and diluted earnings per share. There are no significant adjustments to income from continuing operations and net income for purposes of computing income available to common stockholders for the years ended December 31, 2015, 2014 and 2013. A reconciliation of the weighted-average number of common shares outstanding used in the calculation of basic and diluted earnings per share follows:



	Weighted-Average Common Shares Outstanding
	2015	2014	2013
Basic	55,028,063	54,791,030	53,860,308
Dilutive effect of:
Stock options	206,778	355,595	575,202
Performance share awards	278,378	319,704	280,488
Convertible senior subordinated debt	—	245,230	209,321
Non-Employee Director Deferred Stock Plan	—	11,708	48,025
Diluted	55,513,219	55,723,267	54,973,344

The calculation of weighted-average diluted shares outstanding excludes all anti-dilutive shares. During 2015, 2014 and 2013, the Company excluded 214,032, 89,924 and 133,162 stock awards, respectively, from the calculation of diluted weighted-average shares outstanding as the stock awards were considered anti-dilutive.

On June 16, 2014, $224 (par value) of the 3.375% Convertible Senior Subordinated Notes due in March 2027 (the "3.375% Convertible Notes") were surrendered for conversion. On June 24, 2014, the Company exercised its right to redeem the remaining $55,412 principal amount of the Notes, effective July 31, 2014, and elected to pay cash to holders of the Notes surrendered for conversion, including the value of any residual shares of common stock that were payable to the holders electing to convert their notes into an equivalent share value. Accordingly, the potential shares issuable for the 3.375% Convertible Notes were included in diluted average common shares outstanding for the period prior to the June 24, 2014 notification date. Under the net share settlement method, there were 245,230 and 209,321 potential shares issuable under the Notes that were considered dilutive in 2014 and 2013, respectively.