INCOME TAXES - Components Of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
United States-Federal									$ (1,308)	$ 14,761	$ 1,703
United States-State									(383)	1,347	895
Foreign									7,959	12,153	11,787
Total current income tax expense									6,268	28,261	14,385
Deferred:
United States-Federal									16,760	5,205	(5,273)
United States-State									1,636	466	169
Foreign									(527)	(5,784)	255
Total deferred income tax expense (benefit)									17,869	(113)	(4,849)
Consolidated:
United States-Federal									15,452	19,966	(3,570)
United States-State									1,253	1,813	1,064
Foreign									7,432	6,369	12,042
Income tax expense	$ 1,482	$ 10,134	$ 13,008	$ (487)	$ 5,689	$ 9,569	$ 7,338	$ 5,552	24,137	28,148	$ 9,536
Deferred tax assets:
Receivables reserve	702				1,321				702	1,321
Temporary differences not currently deductible for tax	7,236				8,001				7,236	8,001
Deferred compensation	2,135				2,019				2,135	2,019
Foreign tax credit carryforwards	4,180				10,576				4,180	10,576
Pension	1,153				436				1,153	436
Net operating losses	4,463				4,171				4,463	4,171
Valuation allowance	(7,814)				(13,763)				(7,814)	(13,763)
Total deferred tax asset	12,055				12,761				12,055	12,761
Deferred tax liabilities:
Property, plant and equipment, net	43,718				27,681				43,718	27,681
Intangible assets, net	13,743				12,021				13,743	12,021
Tax on foreign earnings					1,050					1,050
Total deferred tax liabilities	57,461				40,752				57,461	40,752
Net deferred tax liabilities	45,406				27,991				45,406	27,991
Deferred tax assets:
Current					2,588					2,588
Total deferred tax asset					2,588					2,588
Deferred tax liabilities:
Current					213					213
Long term	45,406				30,366				45,406	30,366
Total deferred tax liability	45,406				30,579				45,406	30,579
Net deferred tax liabilities	45,406				27,991				45,406	$ 27,991
Period of cumulative loss										3 years
State
Deferred tax liabilities:
Net operating loss carryforwards	40,700								40,700
NOL carryforward valuation allowance	2,000				1,700				2,000	$ 1,700
Foreign
Deferred tax liabilities:
Net operating loss carryforwards	8,600								8,600
NOL carryforward valuation allowance	1,700				$ 1,400				1,700	$ 1,400
Tax credit carryforwards that expired during the period	6,300								6,300
Undistributed earnings of foreign subsidiaries considered indefinitely reinvested	156,900								156,900
Foreign | Aruba
Deferred tax liabilities:
Net operating loss carryforwards	$ 5,500								$ 5,500