CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Total Comprehensive Income (Loss) summary
Net Income	$ 25,982	$ 53,507	$ 80,264
Translation adjustments	7,317	(690)	(1,519)
Unrealized gain (loss) on defined benefit plan, net of tax	(5,411)	10,008	4,750
Total comprehensive income	27,888	62,825	83,495
Less: NET INCOME attributable to noncontrolling interest	(1,830)	(2,770)	(3,531)
Total comprehensive income attributable to common stockholders	$ 26,058	$ 60,055	$ 79,964