CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Total	Noncontrolling Interest
Beginning Balance at Dec. 31, 2010	$ 945,227	$ 46	$ 716,731	$ 221,311	$ 1,044	$ 939,132	$ 6,095
Beginning Balance (in shares) at Dec. 31, 2010		45,431
Stock-based compensation	1,727		1,727			1,727
Increase in noncontrolling interest due to sale of equity interest in OPC LLC	4,413		2,343			2,343	2,070
Cash dividend declared, $0.05 per share	(2,290)			(2,290)		(2,290)
Net income (loss)	(8,965)			(8,975)		(8,975)	10
Other comprehensive income (loss), net of related taxes:
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge (net of related tax of $29 and $32 for the three months ended Mar. 31, 2012 and 2011 respectively)	(53)				(53)	(53)
Change in unrealized gains or losses on marketable securities available-for-sale (net of related tax of $0 and $14 for the three months ended Mar. 31, 2012 and 2011 respectively)	(23)				(23)	(23)
Ending Balance at Mar. 31, 2011	940,036	46	720,801	210,046	968	931,861	8,175
Ending Balance (in shares) at Mar. 31, 2011		45,431
Beginning Balance at Dec. 31, 2011	906,644	46	725,746	172,331	595	898,718	7,926
Beginning Balance (in shares) at Dec. 31, 2011		45,431
Stock-based compensation	1,657		1,657			1,657
Cash paid to non-controlling interest	(212)						(212)
Net income (loss)	8,025			7,895		7,895	130
Other comprehensive income (loss), net of related taxes:
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge (net of related tax of $29 and $32 for the three months ended Mar. 31, 2012 and 2011 respectively)	(47)				(47)	(47)
Change in unrealized gains or losses on marketable securities available-for-sale (net of related tax of $0 and $14 for the three months ended Mar. 31, 2012 and 2011 respectively)	(30)				(30)	(30)
Ending Balance at Mar. 31, 2012	$ 916,037	$ 46	$ 727,403	$ 180,226	$ 518	$ 908,193	$ 7,844
Ending Balance (in shares) at Mar. 31, 2012		45,431