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DEBT (Details) (USD $) |  |  | 12 Months Ended | 0 Months Ended |  | 0 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Unsecured lines of credit | Dec. 31, 2011 Unsecured lines of credit | Jan. 31, 2012 Revolving credit facility | Dec. 31, 2011 Revolving credit facility | Jan. 31, 2013 Revolving credit facility Subsequent event | Dec. 31, 2012 Notes payable 2.1% - 12.6%, due in monthly and annual installments through 2014 | Dec. 31, 2011 Notes payable 2.1% - 12.6%, due in monthly and annual installments through 2014 | Dec. 31, 2012 Senior unsecured notes 5.4%, due in 2013 | Dec. 31, 2011 Senior unsecured notes 5.4%, due in 2013 | Dec. 31, 2012 Senior unsecured notes 2.3%, due in 2015 | Dec. 31, 2011 Senior unsecured notes 2.3%, due in 2015 | Dec. 31, 2012 Senior unsecured notes 6.0% due in 2016 | Dec. 31, 2011 Senior unsecured notes 6.0% due in 2016 | Dec. 31, 2012 Senior unsecured notes 6.0%, due in 2018 | Dec. 31, 2011 Senior unsecured notes 6.0%, due in 2018 | Dec. 31, 2012 Senior unsecured notes 3.8%, due in 2020 | Dec. 31, 2011 Senior unsecured notes 3.8%, due in 2020 | Dec. 31, 2012 Senior unsecured notes 3.2%, due in 2022 | Dec. 31, 2012 Senior unsecured notes 3.4%, due in 2024 | Dec. 31, 2012 Capital lease obligations | Dec. 31, 2011 Capital lease obligations
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average borrowings |  |  | $ 110,300,000 | $ 112,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average annual interest rate on short-term notes payable (as a percent) | 2.10% | 0.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit, maximum borrowing facility |  |  |  |  | 300,000,000 | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension of maturity date |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, initial amount borrowed |  |  |  |  | 185,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding obligations |  |  |  |  | 165,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term obligations including current maturities | 382,348,000 | 259,026,000 |  |  |  |  |  | 4,410,000 | 5,654,000 | 25,000,000 | 25,000,000 | 16,000,000 | 16,000,000 | 50,000,000 | 50,000,000 | 75,000,000 | 75,000,000 | 84,000,000 | 84,000,000 | 75,000,000 | 50,000,000 | 2,938,000 | 3,372,000
Current maturities of long-term obligations | (29,488,000) | (4,116,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term obligations | 352,860,000 | 254,910,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes payable, low end of range (as a percent) |  |  |  |  |  |  |  | 2.10% | 2.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes payable, high end of range (as a percent) |  |  |  |  |  |  |  | 12.60% | 12.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior unsecured notes (as a percent) |  |  |  |  |  |  |  |  |  | 5.40% | 5.40% | 2.30% | 2.30% | 6.00% | 6.00% | 6.00% | 6.00% | 3.80% | 3.80% | 3.20% | 3.40% |  |
Aggregate long-term maturities, excluding capital lease obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 | 29,068,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 342,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | $ 284,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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