RISK MANAGEMENT (Interest Rate Swaps) (Details) (Interest Rate Swaps Covering April 2013 - July 2015 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Interest Rate Swaps Covering April 2013 - July 2015 [Member]
Derivative Instruments Related to Oil and Gas Production [Line Items]
Notional Amount	$ 110,000
Floating Rate	1 Month LIBOR
Fixed Rate	3.315%

Total monetary amount specified by the derivative liability (or liabilities). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

Name:	us-gaap_DerivativeLiabilityNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant