BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details 7) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES
Advertising expense									$ 185,162	$ 122,932	$ 115,089
Computation of Basic EPS:
Net income (loss)	22,473	71,365	(12,491)	(110,838)	(66,836)	14,104	(47,371)	(8,713)	(29,491)	(108,816)	48,458
Less: net income allocated to participating securities											(3,159)
Net income (loss) for basic EPS calculation									(29,491)	(108,816)	45,299
Total weighted average shares outstanding - basic									85,581	83,356	86,127
Less: weighted average participating shares outstanding											(5,615)
Weighted average common shares outstanding - basic									85,581	83,356	80,512
Basic EPS (in dollars per share)	$ 0.24	$ 0.76	$ (0.15)	$ (1.30)	$ (0.79)	$ 0.16	$ (0.57)	$ (0.11)	$ (0.34)	$ (1.31)	$ 0.56
Computation of Diluted EPS:
Net income (loss)	22,473	71,365	(12,491)	(110,838)	(66,836)	14,104	(47,371)	(8,713)	(29,491)	(108,816)	48,458
Less: net income allocated to participating securities											(3,159)
Net income (loss) for diluted EPS calculation									$ (29,491)	$ (108,816)	$ 45,299
Weighted average common shares outstanding - basic									85,581	83,356	80,512
Add: dilutive effect of common stock equivalents (in shares)											12
Weighted average common shares outstanding - diluted									85,581	83,356	80,524
Diluted EPS (in dollars per share)	$ 0.24	$ 0.66	$ (0.15)	$ (1.30)	$ (0.79)	$ 0.16	$ (0.57)	$ (0.11)	$ (0.34)	$ (1.31)	$ 0.56