During the three months ended September 30, 2017, we repurchased 8,404 of our common shares for $0.8 million. These consisted of rights to shares that 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. During the nine months ended September 30, 2017, we repurchased 77,832 of our common shares for $8.2 million; included in this total were rights to 22,832 shares valued at $2.5 million 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 27,453 and 73,855 treasury shares upon vesting of stock-based awards during the three and nine months ended September 30, 2017, respectively.

In February, May and August 2017, we paid quarterly dividends of $0.55 per share of common stock. In addition, on October 10, 2017, we declared a quarterly dividend of $0.55 per share of common stock for shareholders of record on October 20, 2017 and payable on November 21, 2017.

The following table summarizes our changes in equity for the nine months ended September 30, 2017 (in thousands):



	Common Shares		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Treasury Stock			Non-Controlling Interest			Total Equity
December 31, 2016	$	1,148	$	52,850	$	187,957		$	(9,828	)	$	(80,773	)	$	3,943		$	155,297
Adoption of ASU 2016-09 (see note 14)	—		84		(84		)	—			—			—			—
Stock based-awards	—		8,834		—			—			8,489			—			17,323
Repurchase of common shares	—		—		—			—			(8,197		)	—			(8,197		)
Dividends paid	—		—		(72,861		)	—			—			—			(72,861		)
Non-controlling interest dividends	—		—		—			—			—			(27		)	(27		)
Amortization of deferred pension costs, net of tax	—		—		—			204			—			—			204
Interest rate swaps, net of tax	—		—		—			114			—			—			114
Net income	—		—		61,434			—			—			10			61,444

September 30, 2017	$	1,148	$	61,768	$	176,446		$	(9,510	)	$	(80,481	)	$	3,926		$	153,297

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



	September 30, 2017			December 31, 2016
Prior service cost	$	556		$	600
Unrecognized net actuarial loss	(9,521		)	(9,769		)
Fair value of derivatives, net of tax	(545		)	(659		)
Total accumulated other comprehensive income (loss)	$	(9,510	)	$	(9,828	)