STOCK-BASED COMPENSATION (Details - RSU and RSA Rollforwards) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
RSUs
Nonvested RSUs, RSUs with a performance condition, RSAs and RSAs with a market condition, Number of Shares
Nonvested at the beginning of the period (in shares)	599,122
Granted (in shares)	135,607
Vested (in shares)	(328,681)
Forfeited (in shares)	(54,247)
Nonvested at the end of the period (in shares)	351,801	599,122
Nonvested RSUs, RSUs with a performance condition, RSAs and RSAs with a market condition, Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 14.15
Granted (in dollars per share)	$ 32.33
Vested (in dollars per share)	$ 12.08
Forfeited (in dollars per share)	$ 16.31
Nonvested at the end of the period (in dollars per share)	$ 22.83	$ 14.15
Fair value of RSUs, RSUs with a performance condition, RSAs and RSAs with a market condition that vested during the year	$ 11,000,000	$ 7,500,000	$ 4,300,000
RSU with a performance condition
Nonvested RSUs, RSUs with a performance condition, RSAs and RSAs with a market condition, Number of Shares
Nonvested at the beginning of the period (in shares)	0
Granted (in shares)	500,000
Vested (in shares)	(500,000)
Nonvested at the end of the period (in shares)	0
Nonvested RSUs, RSUs with a performance condition, RSAs and RSAs with a market condition, Weighted Average Grant Date Fair Value
Granted (in dollars per share)	$ 33.59
Vested (in dollars per share)	$ 33.59
Nonvested at the end of the period (in dollars per share)	$ 0.00
Fair value of RSUs, RSUs with a performance condition, RSAs and RSAs with a market condition that vested during the year	22,000
Restricted Stock
Nonvested RSUs, RSUs with a performance condition, RSAs and RSAs with a market condition, Number of Shares
Nonvested at the beginning of the period (in shares)	119,500
Granted (in shares)	43,389
Vested (in shares)	(39,832)
Nonvested at the end of the period (in shares)	123,057	119,500
Nonvested RSUs, RSUs with a performance condition, RSAs and RSAs with a market condition, Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 22.47
Granted (in dollars per share)	$ 25.14
Vested (in dollars per share)	$ 22.47
Nonvested at the end of the period (in dollars per share)	$ 23.41	$ 22.47
Fair value of RSUs, RSUs with a performance condition, RSAs and RSAs with a market condition that vested during the year	1,500,000	3,200,000	800,000
Restricted stock with a market condition
Nonvested RSUs, RSUs with a performance condition, RSAs and RSAs with a market condition, Number of Shares
Nonvested at the beginning of the period (in shares)	62,500
Vested (in shares)	(62,500)
Nonvested at the end of the period (in shares)	0
Nonvested RSUs, RSUs with a performance condition, RSAs and RSAs with a market condition, Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 13.93
Vested (in dollars per share)	$ 13.93
Nonvested at the end of the period (in dollars per share)	$ 0.00
Fair value of RSUs, RSUs with a performance condition, RSAs and RSAs with a market condition that vested during the year	$ 2,100,000