CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement Of Income and Comprehensive Income [Abstract]
Net income (loss)	$ (144)	$ 904	$ 225	$ 2,038
Other comprehensive income:
Retirement benefits adjustment
Total comprehensive income (loss)	$ (144)	$ 904	$ 225	$ 2,038