CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 14,617	$ 18,122	$ 13,242
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on interest rate swap, net of tax		182	(90)
Unrealized loss on nickel hedge contracts, net of tax			(60)
Other comprehensive income (loss), net of tax		182	(150)
Comprehensive income	$ 14,617	$ 18,304	$ 13,092