CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income (loss)	$ 13,672	$ (7,176)	$ 24,575	$ 285
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of $0 tax in the quarter and year to date ended June 30, 2013 and 2012 (Note 2)	(13)	(124)	(164)	(67)
Unrealized gain (loss) on marketable securities, net of $0 tax in the quarter and year to date ended June 30, 2013 and 2012 (Note 2)	(204)	(129)	(258)	162
Amortization of defined benefit pension items, net of tax of $4 and $8 in the quarter and year to date ended June 30, 2013 and $0 in both periods in 2012, respectively (Note 2)	14	0	28	0
Total other comprehensive income (loss)	(203)	(253)	(394)	95
Total comprehensive income (loss)	$ 13,469	$ (7,429)	$ 24,181	$ 380