SUBSEQUENT EVENTS (Details) (USD $)	6 Months Ended		0 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jul. 22, 2013 Subsequent Event [Member]	Jul. 01, 2013 Subsequent Event [Member]
Subsequent events
Business acquisition, effective date of acquisition				Jul. 01, 2013
Business acquisition, cost of acquired entity, cash paid				$ 45,000,000
Contract Date			Jul. 22, 2013
Payments to Acquire Property, Plant, and Equipment	9,840,000	5,289,000	4,900,000
ConstructionContractValue			$ 19,900,000