Stockholders' equity (Tables)

12 Months Ended

Dec. 31, 2012

Shares of Common Stock Issued

The shares of our common stock issued during the past three years consist of employee stock option exercises and stock awards issued annually to members of our board of directors.

	Years ended December 31,
	2010		2011		2012
	(Shares in thousands)
Common stock outstanding at the beginning of the year		48,612		48,631		48,663
Common stock issued		19		32		6
Common stock at end of the year		48,631		48,663		48,669

Schedule of Changes in Accumulated Other Comprehensive Income

Accumulated other comprehensive income (loss)—Changes in accumulated other comprehensive income for 2010, 2011 and 2012 are presented in the table below.

	Years ended December 31,
	2010			2011			2012
	(In thousands)
Accumulated other comprehensive income (loss), net of tax:
Marketable securities:
Balance at beginning of year	$	38,577		$	68,147		$	186,451
Other comprehensive income (loss):
Unrealized gain (loss) arising during the year		29,570			118,304			(71,184	)
Less reclassification adjustment for amounts included in realized gain		—			—			(9,848	)
Balance at end of year	$	68,147		$	186,451		$	105,419
Currency translation:
Balance at beginning of year	$	(128,753	)	$	(127,032	)	$	(133,041	)
Other comprehensive income (loss):
Arising during the year		1,721			(6,009	)		6,605
Less reclassification adjustment for amounts included in gain on disposal		—			—			(8,729	)
Balance at end of year	$	(127,032	)	$	(133,041	)	$	(135,165	)
Defined benefit pension plans:
Balance at beginning of year	$	(52,574	)	$	(51,534	)	$	(59,478	)
Other comprehensive income (loss):
Amortization of prior service cost and net losses included in net periodic pension cost		1,970			1,824			2,254
Net actuarial loss arising during year		(400	)		(9,768	)		(9,178	)
Plan amendment		(530	)		—			—
Balance at end of year	$	(51,534	)	$	(59,478	)	$	(66,402	)
OPEB plans:
Balance at beginning of year	$	(661	)	$	1,592		$	1,344
Other comprehensive income (loss):
Amortization of prior service credit and net losses included in net periodic OPEB cost		(140	)		(581	)		(552	)
Net actuarial gain (loss) arising during year		(772	)		333			103
Plan amendment		3,165			—			—
Balance at end of year	$	1,592		$	1,344		$	895
Total accumulated other comprehensive income (loss), net of tax:
Balance at beginning of year	$	(143,411	)	$	(108,827	)	$	(4,724	)
Other comprehensive income (loss)		34,584			104,103			(90,529	)
Balance at end of year	$	(108,827	)	$	(4,724	)	$	(95,253	)