ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Numerator:
Net (loss) income attributable to common stockholders	$ (14,214)	$ 42,668	$ (32,320)		$ (36,574)
Denominator:
Denominator for basic net (loss) income per share - weighted average outstanding shares	48,737,941	50,006,085	49,299,953		49,997,752
Effect of dilutive securities:
Stock options and restricted stock	0	118,333	0		0
Denominator for diluted net (loss) income per share - weighted-average outstanding shares	48,737,941	50,124,418	49,299,953		49,997,752
Net (loss) income attributable to common stockholders per share - basic (in dollars per share)	$ (0.29)	$ 0.85	$ (0.66)	[1]	$ (0.73)
Net (loss) income attributable to common stockholders per share - diluted (in dollars per share)	$ (0.29)	$ 0.85	$ (0.66)	[1]	$ (0.73)

[1] Per share amounts do not add due to rounding.