EMPLOYEE BENEFIT PLANS (Details 7) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair value hierarchy of Plan's assets
Total investments	$ 180,173,000	$ 152,187,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	180,173,000	152,187,000
Collective short-term investment fund
Fair value hierarchy of Plan's assets
Total investments	3,052,000	6,222,000
Redemption Notice Period	1 day	1 day
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	6,222,000
Fair value of plan assets at end of year	3,052,000	6,222,000
Collective Russell 3000 index fund
Fair value hierarchy of Plan's assets
Redemption Notice Period	1 day	1 day
Fidelity Spartan 500 index fund
Fair value hierarchy of Plan's assets
Redemption Notice Period	1 day	1 day
Defined Benefit Pension Plan
Fair value hierarchy of Plan's assets
Total investments	180,173,000	152,187,000
Amount transferred from level 1 to level 2	0	0
Amount transferred into level 3 from level 2	4,000,000	6,000,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	152,187,000	125,058,000
Fair value of plan assets at end of year	180,173,000	152,187,000
Defined Benefit Pension Plan | Collective short-term investment fund
Fair value hierarchy of Plan's assets
Total investments	3,052,000	6,222,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	3,052,000	6,222,000
Defined Benefit Pension Plan | Collective Russell 3000 index fund
Fair value hierarchy of Plan's assets
Total investments	74,753,000	61,451,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	74,753,000	61,451,000
Defined Benefit Pension Plan | Fidelity Spartan 500 index fund
Fair value hierarchy of Plan's assets
Total investments	45,632,000	34,482,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	45,632,000	34,482,000
Defined Benefit Pension Plan | Equity index funds
Fair value hierarchy of Plan's assets
Total investments	120,385,000	95,933,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	120,385,000	95,933,000
Defined Benefit Pension Plan | Group deposit administration annuity contract
Fair value hierarchy of Plan's assets
Total investments	56,736,000	50,032,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	56,736,000	50,032,000
Defined Benefit Pension Plan | Level 1
Fair value hierarchy of Plan's assets
Total investments	48,684,000	40,704,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	48,684,000	40,704,000
Defined Benefit Pension Plan | Level 1 | Collective short-term investment fund
Fair value hierarchy of Plan's assets
Total investments	3,052,000	6,222,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	3,052,000	6,222,000
Defined Benefit Pension Plan | Level 1 | Equity index funds
Fair value hierarchy of Plan's assets
Total investments	45,632,000	34,482,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	45,632,000	34,482,000
Defined Benefit Pension Plan | Level 2
Fair value hierarchy of Plan's assets
Total investments	74,753,000	61,451,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	74,753,000	61,451,000
Defined Benefit Pension Plan | Level 2 | Equity index funds
Fair value hierarchy of Plan's assets
Total investments	74,753,000	61,451,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	74,753,000	61,451,000
Defined Benefit Pension Plan | Level 3
Fair value hierarchy of Plan's assets
Total investments	56,736,000	50,032,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	50,032,000	41,527,000
Interest income	2,704,000	2,505,000
Transfers from collective short-term investments fund	4,000,000	6,000,000
Fair value of plan assets at end of year	56,736,000	50,032,000
Defined Benefit Pension Plan | Level 3 | Group deposit administration annuity contract
Fair value hierarchy of Plan's assets
Total investments	56,736,000	50,032,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	56,736,000	50,032,000
Group life insurance plan | Money market fund
Fair value hierarchy of Plan's assets
Total investments	6,156,000	6,174,000
Amount of transfer between levels	0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	6,174,000	6,193,000
Fair value of plan assets at end of year	6,156,000	6,174,000
Group life insurance plan | Level 1 | Money market fund
Fair value hierarchy of Plan's assets
Total investments	6,156,000	6,174,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year	$ 6,156,000	$ 6,174,000