SHAREHOLDERS' EQUITY

12 Months Ended

Dec. 31, 2019

Basic and diluted net income per share was determined based on the following share data (in thousands):



	Year Ended December 31,
	2019	2018	2017
Weighted average basic common shares	12,834	12,504	11,945
Effect of stock options	747	1,043	1,626
Effect of dilutive share awards	167	153	111
Effect of Convertible Senior Notes and warrants	871	397	—
Weighted average diluted common shares	14,619	14,097	13,682

For the years ended December 31, 2019, 2018 and 2017, the weighted average shares that were anti-dilutive, and therefore excluded from the calculation of diluted income per share, included options to purchase 0.1 million, 0.4 million and 0.1 million shares of common stock, respectively.

The 0.625% Convertible Senior Notes due June 1, 2022 and the warrants issued by the Company in 2017 could be converted into the Company’s common stock, subject to certain contingencies. See Note 14—Debt for additional information. Shares of the Company’s common stock associated with these instruments were excluded from the calculation of diluted income per share during 2017 as they were anti-dilutive since the conversion price of the Convertible Senior Notes and the strike price of the warrants were greater than the average market price of the Company’s common stock.

See Note 12—Stock-Based Compensation for a full description of outstanding equity awards.

Common Stock Repurchases

In each of February 2018 and February 2019, the board of directors authorized and the Company announced the repurchase of up to $100.0 million and $150.0 million, respectively, of LendingTree's common stock. During the years ended December 31, 2019, 2018 and 2017, the Company purchased 22,731, 379,449 and 75,393 shares, respectively, of its common stock for aggregate consideration of $5.5 million, $92.6 million and $21.0 million, respectively. At December 31, 2019, $179.7 million remains authorized for share repurchase.