Accumulated other comprehensive income (loss). Accumulated other comprehensive income comprises changes in equity as presented in the table below. See Note 6 for amounts related to our defined benefit pension plans and OPEB plans.


	Years ended December 31,
	2010			2011			2012
	(In thousands)

Accumulated other comprehensive income (loss), net of tax:
Defined benefit pension plans:
Balance at beginning of year	$	(158,401	)	$	(116,745	)	$	(192,552	)
Other comprehensive income (loss):
Net actuarial gain (loss) arising during year		31,388			(80,963	)		922
Amortization of prior service cost		761			744			744
Amortization of net actuarial losses		9,507			4,412			11,155

Balance at end of year	$	(116,745	)	$	(192,552	)	$	(179,731	)


Defined benefit OPEB plans:
Balance at beginning of year	$	25,871		$	19,438		$	10,459
Other comprehensive income (loss):
Net actuarial loss arising during year		(1,581	)		(4,025	)		(2,777	)
Amortization of prior service credit		(9,990	)		(9,765	)		(9,766	)
Amortization of net actuarial losses		5,138			4,811			4,773

Balance at end of year	$	19,438		$	10,459		$	2,689


Total accumulated other comprehensive income (loss):
Balance at beginning of year	$	(132,530	)	$	(97,307	)	$	(182,093	)
Other comprehensive income (loss)		35,223			(84,786	)		5,051

Balance at end of year	$	(97,307	)	$	(182,093	)	$	(177,042	)