Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Comprehensive Income [Abstract]
NET INCOME (LOSS)	$ (184)	$ 8,247	$ 51,148
Other Comprehensive income (loss):
Defined benefit pension plan net gain (loss) arising during the period	1,937	(676)	1,868
Other comprehensive income (loss)	1,937	(676)	1,868
COMPREHENSIVE INCOME	1,753	7,571	53,016
Less: Comprehensive income attributable to noncontrolling interests	(30)	(47)	(57)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ 1,723	$ 7,524	$ 52,959