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LONG-TERM DEBT (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 27, 2014 | Dec. 31, 2016 | Dec. 26, 2015 | Oct. 17, 2014 | Sep. 22, 2014
Long-term debt: |  |  |  |  |
Aggregate principal amount |  | $ 250,200,000 | $ 250,200,000 |  |
Debt issuance costs |  | (6,646,000) | (7,046,000) |  |
Total long-term debt |  | 755,646,000 | 757,995,000 |  |
Less current installments of long-term debt |  | 851,000 | 1,077,000 |  |
Long-term debt, excluding current installments |  | $ 754,795,000 | $ 756,918,000 |  |
Effective interest rate (as a percent) |  | 1.00% | 1.00% |  |
Minimum aggregate maturities of long-term debt |  |  |  |  |
2016 |  | $ 894,000 |  |  |
2017 |  | 890,000 |  |  |
2018 |  | 749,000 |  |  |
2019 |  | 250,954,000 |  |  |
2020 |  | 762,000 |  |  |
5.00% senior unsecured notes due 2044 |  |  |  |  |
Long-term debt: |  |  |  |  |
Aggregate principal amount |  | 250,000,000 | $ 250,000,000 |  |
Unamortized premium on senior unsecured notes |  | $ 1,120,000 |  |  |
Redemption price of notes, stated as a percentage of principal amount (as a percent) |  | 100.00% |  |  |
Interest rate on notes (as a percent) |  | 5.00% |  |  |
5.25% senior unsecured notes due 2054 |  |  |  |  |
Long-term debt: |  |  |  |  |
Aggregate principal amount |  | $ 250,000,000 | 250,000,000 |  |
Unamortized premium on senior unsecured notes |  | $ 3,240,000 |  |  |
Redemption price of notes, stated as a percentage of principal amount (as a percent) |  | 100.00% |  |  |
Interest rate on notes (as a percent) |  | 5.30% |  |  |
Unamortized discount on 5.00% and 5.25% senior unsecured notes |  |  |  |  |
Long-term debt: |  |  |  |  |
Unamortized premium on senior unsecured notes |  | $ (4,360,000) | (4,405,000) |  |
6.625% senior unsecured notes due in April 2020 |  |  |  |  |
Long-term debt: |  |  |  |  |
Aggregate principal amount |  | 250,200,000 |  |  |
Unamortized premium on senior unsecured notes |  | $ 3,557,000 | 4,518,000 |  |
Unamortized premium recognized as revenue | $ 4,439,000 |  |  |  |
Redemption price of notes, stated as a percentage of principal amount (as a percent) |  | 100.00% |  |  |
Cash prepayment expenses | $ 41,200,000 |  |  |  |
Interest rate on notes (as a percent) |  | 6.60% |  |  |
Repurchase amount through partial tender offer |  |  |  |  | $ 199,800,000
Revolving credit agreement |  |  |  |  |
Long-term debt: |  |  |  |  |
Total long-term debt |  | $ 0 | 0 |  |
Previous borrowing capacity |  |  |  | $ 400,000,000 |
Maximum borrowing capacity |  |  |  | $ 600,000,000 |
Increase in borrowing capacity, maximum |  | 200,000,000 |  |  |
Additional borrowing capacity |  | 584,600,000 |  |  |
Standby letters of credit outstanding |  | $ 15,400,000 |  |  |
Revolving credit agreement | Minimum |  |  |  |  |
Long-term debt: |  |  |  |  |
Basis points added to variable rate (as a percent) |  | 0.00% |  |  |
Revolving credit agreement | Maximum |  |  |  |  |
Long-term debt: |  |  |  |  |
Basis points added to variable rate (as a percent) |  | 6250.00% |  |  |
Revolving credit agreement | LIBOR |  |  |  |  |
Long-term debt: |  |  |  |  |
Variable interest rate basis |  | LIBOR (based on a 1, 2, 3 or 6 month interest period, as selected by the Company) |  |  |
Basis points added to variable rate (as a percent) |  | 10000.00% |  |  |
Variable interest rate, base period |  | 1 month |  |  |
Revolving credit agreement | LIBOR | Minimum |  |  |  |  |
Long-term debt: |  |  |  |  |
Basis points added to variable rate (as a percent) |  | 10000.00% |  |  |
Revolving credit agreement | LIBOR | Maximum |  |  |  |  |
Long-term debt: |  |  |  |  |
Basis points added to variable rate (as a percent) |  | 16250.00% |  |  |
Revolving credit agreement | Prime lending rate |  |  |  |  |
Long-term debt: |  |  |  |  |
Variable interest rate basis |  | prime lending rate |  |  |
Revolving credit agreement | Federal Funds rate |  |  |  |  |
Long-term debt: |  |  |  |  |
Variable interest rate basis |  | Federal Funds rate |  |  |
Basis points added to variable rate (as a percent) |  | 5000.00% |  |  |
IDR Bonds |  |  |  |  |
Long-term debt: |  |  |  |  |
Total long-term debt |  | $ 8,500,000 | 8,500,000 |  |
Other notes |  |  |  |  |
Long-term debt: |  |  |  |  |
Total long-term debt |  | 4,395,000 | $ 6,228,000 |  |
Short Term Bank Lines Of Credit |  |  |  |  |
Long-term debt: |  |  |  |  |
Additional borrowing capacity |  | 109,400,000 |  |  |
Balance |  | $ 109,400,000 |  |  |

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