INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Effective Tax Amount
Federal statutory tax rate applied to income before taxes	$ 18,822	$ (13,690)	$ 33,612	$ (4,946)
Differential arising from:
State	2,425	(928)	2,220	(485)
Non-deductible expenses	3,537	2,036	2,669	2,438
Domestic manufacturing deduction	0	(577)	0	(1,386)
Contingent consideration	1,442	1,823	(20,773)	2,241
2013 Federal research credit	0	(6,394)	0	(7,701)
Prior year federal research credits	0	(360)	0	(4,401)
Transaction costs	0	2,739	0	2,739
Non-deductible loss on extinguishment of 2017 Notes	0	9,538	0	9,538
Impact of reserve for uncertain tax positions	88	39	257	(371)
Foreign rate differential	3,989	(90)	5,751	(110)
Valuation allowance - foreign losses	1,252	0	1,836	0
Other	(606)	644	(629)	878
Total	$ 30,949	$ (5,220)	$ 24,943	$ (1,566)
Federal statutory tax rate applied to income before taxes	35.00%	35.00%	35.00%	35.00%
Differential arising from:
State	4.50%	2.40%	2.30%	3.40%
Non-deductible expenses	6.60%	(5.20%)	2.80%	(17.30%)
Domestic manufacturing deduction	0.00%	1.50%	0.00%	9.80%
Contingent consideration	2.70%	(4.70%)	(21.60%)	(15.80%)
2013 Federal research credit	0.00%	16.30%	0.00%	54.50%
Prior year federal research credits	0.00%	0.90%	0.00%	31.10%
Transaction costs	0.00%	(7.00%)	0.00%	(19.40%)
Non-deductible loss on extinguishment of 2017 Notes	0.00%	(24.40%)	0.00%	(67.50%)
Impact of reserve for uncertain tax positions	0.20%	(0.10%)	0.30%	2.60%
Foreign rate differential	7.40%	0.20%	6.00%	0.80%
Valuation allowance - foreign losses	2.30%	0.00%	1.90%	0.00%
Other	(1.20%)	(1.60%)	(0.70%)	(6.10%)
Total	57.50%	13.30%	26.00%	11.10%