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LONG-TERM DEBT (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |
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Jun. 26, 2011 | Dec. 31, 2011 | Dec. 25, 2010 | Dec. 31, 2011 LIBOR | Dec. 31, 2011 Federal Funds rate | Apr. 30, 2010 6.625% senior unsecured notes due in April 2020 | Dec. 31, 2011 6.625% senior unsecured notes due in April 2020 | Dec. 25, 2010 6.625% senior unsecured notes due in April 2020 | Apr. 08, 2010 6.625% senior unsecured notes due in April 2020 | Jun. 30, 2011 6.875% Senior Subordinated Notes | Dec. 31, 2011 6.875% Senior Subordinated Notes | Dec. 25, 2010 6.875% Senior Subordinated Notes | May 04, 2004 6.875% Senior Subordinated Notes | Dec. 31, 2011 Revolving credit agreement | Dec. 25, 2010 Revolving credit agreement | Dec. 31, 2011 Revolving credit agreement LIBOR week | Dec. 31, 2011 Revolving credit agreement LIBOR Minimum week | Dec. 31, 2011 Revolving credit agreement LIBOR Maximum week | Dec. 31, 2011 Revolving credit agreement Prime lending rate | Dec. 31, 2011 Revolving credit agreement Federal Funds rate | Dec. 31, 2011 Revolving credit agreement Federal Funds rate Minimum | Dec. 31, 2011 Revolving credit agreement Federal Funds rate Maximum | Dec. 31, 2011 IDR Bonds | Dec. 25, 2010 IDR Bonds | Dec. 31, 2011 1.75% to 3.485% notes | Dec. 25, 2010 1.75% to 3.485% notes
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt |  | $ 474,650 | $ 468,834 |  |  |  | $ 450,000 | $ 300,000 |  |  |  | $ 150,000 |  |  | $ 8,000 |  |  |  |  |  |  |  | $ 8,500 | $ 8,500 | $ 2,050 | $ 2,334
Unamortized premium on senior unsecured notes |  |  |  |  |  |  | 14,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less current installments of long-term debt |  | 235 | 238 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, excluding current installments |  | 474,415 | 468,596 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes (as a percent) |  |  |  |  |  |  | 6.625% | 6.625% | 6.625% |  | 6.875% | 6.875% | 6.875% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes, low end of the range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75% |
Interest rate on notes, high end of the range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.485% |
Aggregate principal amount |  |  |  |  |  |  | 450,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes issued | 150,000 |  |  |  |  | 300,000 | 300,000 | 300,000 |  | 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes redeemed |  |  |  |  |  |  |  |  |  |  | 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price of notes, stated as a percentage of principal amount (as a percent) |  |  |  |  |  |  |  |  |  |  | 101.146% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption premium recorded in interest expense |  |  |  |  |  |  |  |  |  |  | 1,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 280,000 |  |  |  |  |  |  |  |  |  |  |  |
Increase in borrowing capacity, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate basis |  |  |  | LIBOR (based on a 1 week or 1, 2, 3, or 6 month interest period) |  |  |  |  |  |  |  |  |  |  |  | LIBOR (based on a 1, 2, 3 or 6 month interest period, as selected by the Company) | LIBOR (based on a 1, 2, 3 or 6 month interest period, as selected by the Company) | LIBOR (based on a 1, 2, 3 or 6 month interest period, as selected by the Company) | Prime lending rate | Federal Funds Rate | Federal Funds Rate | Federal Funds Rate |  |  |  |
Basis points added to variable rate (as a percent) |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  | 1.25% | 2.00% |  | 0.50% | 0.25% | 1.00% |  |  |  |
Variable interest rate, base period (in weeks) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 | 1 |  |  |  |  |  |  |  |
Additional borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 260,869 |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.24% | 0.50% |  |
Minimum aggregate maturities of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  | 235 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 |  | 283 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 |  | 268 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 |  | $ 281 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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