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DEBT (Schedule of Debt) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2016 | Apr. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 01, 2015
Debt Instrument [Line Items] |  |  |  |  |
Debt Issuance Cost |  |  | $ 1,491 | $ 1,586 |
Long-term debt |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  | 704,247 | 703,835 |
Less current portion |  |  | 111 | 131 |
Long-term debt, less current portion |  |  | 704,136 | 703,704 |
Short-term debt |  |  |  |  |
Amounts due banks, interest at 31.8% (29.0% in 2016) |  |  | 2,020 | 1,758 |
Current portion of long-term debt |  |  | 111 | 131 |
Total short-term debt |  |  | 2,131 | 1,889 |
Total debt |  |  | $ 706,267 | $ 705,593 |
Short-term Debt, Weighted Average Interest Rate |  |  | 31.80% | 29.00% |
Senior Notes 2015 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  | 3.50%
Debt Instrument, Face Amount |  |  |  |  | $ 350,000
Weighted Average [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Term | 18 years | 19 years | 18 years |  |
Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  | 3.30% |  |
Long-term debt |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  | $ 693,424 | $ 692,975 |
Other borrowings due through 2023, interest up to 8.0% |  |  |  |  |
Long-term debt |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  | $ 10,823 | $ 10,860 |
Minimum |  |  |  |  |
Short-term debt |  |  |  |  |
Derivative, Variable Interest Rate |  |  | 2.00% |  |
Minimum | Senior Notes 2015 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Term |  | 10 years |  |  |
Minimum | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.80% |  |
Maximum |  |  |  |  |
Short-term debt |  |  |  |  |
Derivative, Variable Interest Rate |  |  | 3.20% |  |
Maximum | Senior Notes 2015 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Term |  | 30 years |  |  |
Maximum | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.00% |  |
Maximum | Other borrowings due through 2023, interest up to 8.0% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.00% |  |
Senior Notes Series A [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 100,000 |  |
Debt Instrument, Maturity Date |  |  | Aug. 20, 2025 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.15% |  |
Senior Notes Series B [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 100,000 |  |
Debt Instrument, Maturity Date |  |  | Aug. 20, 2030 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.35% |  |
Senior Notes Series C [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 50,000 |  |
Debt Instrument, Maturity Date |  |  | Apr. 01, 2035 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.61% |  |
Senior Notes Series D [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 100,000 |  |
Debt Instrument, Maturity Date |  |  | Apr. 01, 2045 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.02% |  |
Designated as Hedging Instruments | Interest Rate Swap [Member] |  |  |  |  |
Short-term debt |  |  |  |  |
Derivative, Notional Amount |  |  | $ 100,000 |  |

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