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INTEREST RATE SWAP AGREEMENTS (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 Derivative | Dec. 31, 2012 Derivative | Dec. 31, 2011
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 expense pertaining to the interest rate swaps | 9,963 | 13,440 | 28,854
Interest Rate Swap, 4.485% [Member] |  |  |
Interest rate swaps designated as cash flow hedges |  |  |
Fixed rate (as a percent) (in hundredths) | 4.485% |  |
Notional amount outstanding | 106,233 | 106,233 |
Interest Rate Swap, 5.25% [Member] |  |  |
Interest rate swaps designated as cash flow hedges |  |  |
Fixed rate (as a percent) (in hundredths) | 5.25% |  |
Notional amount outstanding | 50,000 | 50,000 |
Interest Rate Swap, 5.075% [Member] |  |  |
Interest rate swaps designated as cash flow hedges |  |  |
Fixed rate (as a percent) (in hundredths) | 5.075% |  |
Notional amount outstanding | 0 | 50,000 |
Interest Rate Swap, 2.05% [Member] |  |  |
Interest rate swaps designated as cash flow hedges |  |  |
Fixed rate (as a percent) (in hundredths) | 2.05% |  |
Notional amount outstanding | 100,000 | 100,000 |
Interest Rate Swap, 2.45% [Member] |  |  |
Interest rate swaps designated as cash flow hedges |  |  |
Fixed rate (as a percent) (in hundredths) | 2.45% |  |
Notional amount outstanding | $ 50,000 | $ 50,000 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 + 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 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 2: 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 + Details
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