INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Effective Tax Amount
Federal statutory tax rate applied to income before taxes	$ 7,488	$ 17,587	$ 8,744	$ 35,593
Differential arising from:
State	364	810	442	1,776
Non-deductible expenses	392	372	402	674
Domestic manufacturing deduction	(689)	(1,467)	(809)	(2,920)
Contingent consideration	375	655	418	1,326
2013 Federal research credit	(1,188)		(1,307)
2012 Federal research credit			(4,041)
Impact of reserve for uncertain tax positions	(805)	(10,922)	(409)	(10,850)
Other	216	90	214	178
Effective tax amount	$ 6,153	$ 7,125	$ 3,654	$ 25,777
Effective Tax Rate
Federal statutory rate applied to income before taxes (as a percent)	35.00%	35.00%	35.00%	35.00%
Differential arising from:
State (as a percent)	1.70%	1.60%	1.80%	1.80%
Non-deductible expenses (as a percent)	1.80%	0.70%	1.60%	0.70%
Domestic manufacturing deduction (as a percent)	(3.20%)	(2.90%)	(3.20%)	(2.90%)
Contingent consideration (as a percent)	1.80%	1.30%	1.70%	1.30%
2013 Federal research credit (as a percent)	(5.50%)		(5.20%)
2012 Federal research credit (as a percent)			(16.20%)
Impact of reserve for uncertain tax positions (as a percent)	(3.80%)	(21.70%)	(1.60%)	(10.70%)
Other (as a percent)	1.00%	0.20%	0.70%	0.10%
Total (as a percent)	28.80%	14.20%	14.60%	25.30%