SEGMENT AND GEOGRAPHICAL REPORTING, Adjustments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Adjustment for [Abstract]
Operating income for reportable segments	$ 133,518	$ 89,866	$ 68,004
Amortization of intangibles	10,886	6,572	5,824
Corporate and other expense, net	32,110	27,809	25,089
Total operating income	90,522	55,485	37,091
Interest expense, net	5,560	3,518	5,208
Other expense (income), net	(47)	(28)	(249)
Income (loss) before income taxes	85,009	51,995	32,132
Identifiable assets at year end	569,732	405,338	320,624
Depreciation	7,196	3,510	3,744
Corporate [Member]
Adjustment for [Abstract]
Capital expenditures	9,000	2,500	0
Identifiable assets at year end	22,000	11,200	9,300
Depreciation	$ 1,000	$ 800	$ 600