EQUITY

During the three and nine months ended September 30, 2018, we repurchased 6,736 and 42,994 of our common shares for $0.8 million and $4.8 million, respectively. These included rights to 6,736 and 22,994 shares valued at $0.8 million and $2.5 million, respectively, which were surrendered to us pursuant to the terms of a stock-based compensation plan in consideration of the participants' tax burdens that may result from the issuance of common shares under that plan. Such common shares, unless canceled, may be reissued for a variety of purposes such as future acquisitions, non-employee director stock awards or employee stock awards. We distributed 23,931 and 79,520 treasury shares upon vesting of stock-based awards during the three and nine months ended September 30, 2018, respectively.

In February, May and August 2018, we paid a quarterly dividend of $0.55 per share of common stock. In addition, on October 9, 2018, we declared a quarterly dividend of $0.55 per share of common stock for shareholders of record on October 19, 2018 and payable on November 20, 2018.

The following table summarizes our changes in equity for the nine months ended September 30, 2018 (in thousands):



	Common Shares		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Treasury Stock			Non-Controlling Interest			Total Equity
December 31, 2017	$	1,148	$	54,463	$	173,855		$	(8,353	)	$	(76,269	)	$	3,888		$	148,732
Stock based-awards	—		7,186		—			—			11,347			—			18,533
Repurchase of common shares	—		—		—			—			(4,777		)	—			(4,777		)
Dividends paid	—		—		(72,929		)	—			—			—			(72,929		)
Non-controlling interest additions	—		—		—			—			—			(10		)	(10		)
Amortization of deferred pension costs, net of tax	—		—		—			145			—			—			145
Interest rate swaps, net of tax	—		—		—			931			—			—			931
Net income	—		—		70,691			—			—			96			70,787

September 30, 2018	$	1,148	$	61,649	$	171,617		$	(7,277	)	$	(69,699	)	$	3,974		$	161,412

Accumulated other comprehensive income (loss) consisted of the following (in thousands):



	September 30, 2018			December 31, 2017
Prior service cost	$	497		$	541
Unrecognized net actuarial loss	(8,514		)	(8,703		)
Fair value of derivatives, net of tax	740			(191		)
Total accumulated other comprehensive income (loss)	$	(7,277	)	$	(8,353	)