EARNINGS PER SHARE (EPS) (Details 2) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Numerator:
Net income used for basic income per common share	$ 118,175	$ 89,064	$ 329,263	$ 199,629
Denominator:
Weighted average shares used for basic income per common share (in shares)	76,679	75,192	76,213	75,092
Basic income per common share (in dollars per share)	$ 1.54	$ 1.18	$ 4.32	$ 2.66
Numerator:
Net income used for basic income per common share	$ 118,175	$ 89,064	$ 329,263	$ 199,629
Denominator:
Weighted average shares used for basic income per common share (in shares)	76,679	75,192	76,213	75,092
Effect of dilutive securities:
Convertible subordinated notes and warrants (in shares)	10,426	4,572	5,903	5,291
Employee stock options and restricted stock units (in shares)	1,198	743	755	840
Weighted average shares used for diluted income per common share (in shares)	88,303	80,507	82,871	81,223
Diluted income per common share (in dollars per share)	$ 1.34	$ 1.11	$ 3.97	$ 2.46
Anti-dilutive shares excluded from the calculation of diluted income per common share
Weighted average shares excluded (in shares)	25,854	33,017	28,591	33,102
Convertible subordinated notes and warrants
Anti-dilutive shares excluded from the calculation of diluted income per common share
Weighted average shares excluded (in shares)	24,805	28,218	24,805	28,277
Employee stock options
Anti-dilutive shares excluded from the calculation of diluted income per common share
Weighted average shares excluded (in shares)	1,049	4,799	3,786	4,825