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INTEREST RATE SWAP AGREEMENTS (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 item | Dec. 31, 2012 item
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INTEREST RATE SWAP AGREEMENTS |  |
Number of interest rate swap agreements outstanding | 4 | 5
Interest rate swaps designated as cash flow hedges |  |
Notional amount outstanding | $ 306,233 | $ 356,233
Interest rate swap, with 4.485% fixed rate and start date of 14 September, 2005 |  |
Interest rate swaps designated as cash flow hedges |  |
Fixed rate (as a percent) | 4.485% | 4.485%
Notional amount outstanding | 106,233 | 106,233
Interest rate swap, with 5.25% fixed rate and start date of 2 January, 2007 |  |
Interest rate swaps designated as cash flow hedges |  |
Fixed rate (as a percent) | 5.25% | 5.25%
Notional amount outstanding | 50,000 | 50,000
Interest rate swap, with 5.075% fixed rate and start date of 2 January, 2008 |  |
Interest rate swaps designated as cash flow hedges |  |
Fixed rate (as a percent) | 5.075% | 5.075%
Notional amount outstanding |  | 50,000
Interest rate swap, with 2.05% fixed rate and start date of 22 January, 2009 |  |
Interest rate swaps designated as cash flow hedges |  |
Fixed rate (as a percent) | 2.05% | 2.05%
Notional amount outstanding | 100,000 | 100,000
Interest rate swap, with 2.45% fixed rate and start date of 23 February, 2009 |  |
Interest rate swaps designated as cash flow hedges |  |
Fixed rate (as a percent) | 2.45% | 2.45%
Notional amount outstanding | $ 50,000 | $ 50,000

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- Definition Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract. + References 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 + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References 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 -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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