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INCOME TAXES (RateRec) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation between the effective income tax rate, as computed on income (loss) before income taxes, and the statutory federal income tax rate                      
Income tax provision at the statutory federal rate                 $ 9,901 $ 25,457 $ 24,714
Federal income tax effects of:                      
State income taxes                 (357) (1,314) (1,186)
Nondeductible expenses                 1,653 1,426 1,239
Life insurance proceeds and changes in cash surrender value                 (1,001) (110) (1,329)
Dividends received deduction                 (11) (3) (6)
Alternative fuel tax credit                 (1,180) (1,141) (1,148)
Increase (decrease) in valuation allowances                 (61) 22 (696)
Other                 (1,387) (2,267) (1,950)
Federal income tax provision                 7,557 22,070 19,638
State income tax provision                 1,019 3,754 3,389
Foreign income tax provision                 1,059 2,056 1,408
Total provision (benefit) for income taxes $ (488) $ 7,615 $ 6,150 $ (3,642) $ 1,878 $ 12,892 $ 12,942 $ 167 $ 9,635 $ 27,880 $ 24,435
Effective tax rate (as a percent)                 34.10% 38.30% 34.60%
Income taxes paid, excluding income tax refunds                 $ 24,300 $ 39,000 $ 40,400
Income tax refunds                 32,500 21,300 11,900
Tax benefit of options exercised and dividends on share-based payment awards                     $ 100
Maximum                      
Federal income tax effects of:                      
Tax benefit of options exercised and dividends on share-based payment awards                 $ 100 $ 100