Earnings Per Share

12 Months Ended

Dec. 31, 2015

Basic earnings per share is computed by dividing net income by the weighted-average number of shares of common stock outstanding during the period presented. Diluted earnings per share is computed by including the net increase in shares as if dilutive outstanding stock options were exercised and restricted stock awards were vested, using the treasury stock method.

Basic and diluted earnings per share has been computed based on the following:



	Years ended
(Dollars in thousands, except per share data)	December 31, 2015		December 31, 2014	December 31, 2013
Net income available to common stockholders, basic and diluted	$	116,127	112,755	95,644
Average outstanding shares - basic	75,542,455		74,641,957	73,191,713
Add: dilutive stock options and awards	53,126		45,358	68,565
Average outstanding shares - diluted	75,595,581		74,687,315	73,260,278
Basic earnings per share	$	1.54	1.51	1.31
Diluted earnings per share	$	1.54	1.51	1.31

There were 0, 0 and 38,915 stock options or restricted stock awards excluded from the diluted average outstanding share calculation for the years ended December 31, 2015, 2014, and 2013, respectively, because to do so would have been anti-dilutive for those periods. Anti-dilution occurs when the exercise price of a stock option or the unrecognized compensation cost per share of a restricted stock award exceeds the market price of the Company’s stock.