DISCLOSURES ABOUT SEGMENTS OF AN ENTERPRISE AND RELATED INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Before Income Taxes
Total operating profit	$ 16,983	$ 13,040	$ 49,408	$ 39,250
Depreciation and amortization expense	(3,120)	(3,791)	(9,331)	(10,623)
Gain on derivative instrument		1,259		3,448
Loss on debt repayment				(440)
Interest income	197	215	597	651
Interest expense, net of intercompany elimination	(9,758)	(11,191)	(29,322)	(33,552)
Income before income taxes	7,327	3,321	22,411	10,614
Reportable segments
Income Before Income Taxes
Total operating profit	21,138	17,954	63,161	53,741
Depreciation and amortization expense	(2,370)	(2,868)	(7,186)	(8,224)
Interest income	562	641	1,746	1,977
Interest expense, net of intercompany elimination	(552)	(668)	(1,730)	(1,921)
Unallocated amount
Income Before Income Taxes
G & A expense	(3,490)	(4,020)	(9,864)	(10,779)
Depreciation and amortization expense	(750)	(923)	(2,145)	(2,399)
Gain on derivative instrument		1,259		3,448
Loss on debt repayment				(440)
Interest expense, net of intercompany elimination	(9,206)	(10,523)	(27,592)	(31,631)
Elimination of intercompany
Income Before Income Taxes
Interest income	$ (365)	$ (426)	$ (1,149)	$ (1,326)