PENSION AND OTHER SAVING PLAN - Balance Sheet Disclosures (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Change in benefit obligation:
Net benefit obligation at end of year	$ 211,100,000	$ 158,700,000
Amounts recognized in the accompanying balance sheet consist of:
Accumulated other comprehensive loss	75,781,000	32,547,000	122,246,000	95,624,000
Pension Benefits [Member]
Amounts recognized in accumulated other comprehensive loss consist of:
Increase in pension and SERP liabilities	25,600,000
Pension [Member]
Change in benefit obligation:
Net benefit obligation at beginning of year	155,075,000	172,289,000
Liability acquired	36,087,000	0
Service cost	2,425,000	2,346,000	2,139,000
Interest cost	7,963,000	6,209,000	6,330,000
Actuarial loss (gain)	32,505,000	(18,972,000)
Benefits and expenses paid	(15,119,000)	(6,797,000)
Settlements and curtailments	(10,862,000)	0
Plan amendments	207,000	0
Foreign currency exchange rate changes	(1,315,000)	0
Net benefit obligation at end of year	206,966,000	155,075,000	172,289,000
Change in plan assets:
Fair value of plan assets at beginning of year	134,149,000	121,887,000
Assets acquired	36,616,000	0
Actual return on plan assets	14,392,000	18,414,000
Employer contributions	4,812,000	645,000
Settlements	(12,795,000)	0
Foreign currency exchange rate changes	(1,108,000)	0
Fair value of plan assets at end of year	160,947,000	134,149,000	121,887,000
Unfunded status at end of year	(46,019,000)	(20,926,000)
Amounts recognized in the accompanying balance sheet consist of:
Current liability	0	0
Noncurrent liability	(46,019,000)	(20,926,000)
Accumulated other comprehensive loss	34,249,000	11,045,000
Net amount recognized at end of year	(11,770,000)	(9,881,000)
Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss	34,164,000	11,045,000
Prior service cost	85,000	0
Accumulated other comprehensive loss (gain)	34,249,000	11,045,000
SERP [Member]
Change in benefit obligation:
Net benefit obligation at beginning of year	3,640,000	4,241,000
Liability acquired	0	0
Service cost	0	0	0
Interest cost	168,000	152,000	172,000
Actuarial loss (gain)	704,000	(359,000)
Benefits and expenses paid	(383,000)	(394,000)
Settlements and curtailments	0	0
Plan amendments	0	0
Foreign currency exchange rate changes	0	0
Net benefit obligation at end of year	4,129,000	3,640,000	4,241,000
Change in plan assets:
Fair value of plan assets at beginning of year	0	0
Assets acquired	0	0
Actual return on plan assets	0	0
Employer contributions	383,000	394,000
Settlements	0	0
Foreign currency exchange rate changes	0	0
Fair value of plan assets at end of year	0	0	0
Unfunded status at end of year	(4,129,000)	(3,640,000)
Amounts recognized in the accompanying balance sheet consist of:
Current liability	(368,000)	(390,000)
Noncurrent liability	(3,760,000)	(3,250,000)
Accumulated other comprehensive loss	1,815,000	1,209,000
Net amount recognized at end of year	(2,313,000)	(2,431,000)
Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss	1,815,000	1,209,000
Prior service cost	0	0
Accumulated other comprehensive loss (gain)	$ 1,815,000	$ 1,209,000