EARNINGS (LOSS) PER SHARE ("EPS") (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Computation of Basic EPS:
Net income (loss)	$ 71,365	$ 14,104	$ (51,964)	$ (41,980)
Less: net income allocated to participating securities	(5,808)	(939)
Net income (loss) for basic EPS calculation	65,557	13,165	(51,964)	(41,980)
Total weighted average shares outstanding - basic	93,338,000	89,523,000	85,382,000	83,003,000
Less: weighted average participating shares outstanding	(7,596,000)	(5,958,000)
Weighted average common shares outstanding - basic	85,742,000	83,565,000	85,382,000	83,003,000
Basic EPS (in dollars per share)	$ 0.76	$ 0.16	$ (0.61)	$ (0.51)
Computation of Diluted EPS:
Net income (loss)	71,365	14,104	(51,964)	(41,980)
Less: net income allocated to participating securities	(5,808)	(939)
Add: interest expense, net of tax, on Convertible Notes	7,834
Net income (loss) for diluted EPS calculation	$ 73,391	$ 13,165	$ (51,964)	$ (41,980)
Weighted average common shares outstanding - basic	85,742,000	83,565,000	85,382,000	83,003,000
Add: dilutive effect of common stock equivalents (in shares)	26,021,000
Weighted average common shares outstanding - diluted	111,763,000	83,565,000	85,382,000	83,003,000
Diluted EPS (in dollars per share)	$ 0.66	$ 0.16	$ (0.61)	$ (0.51)
Antidilutive shares
Common stock issued in connection with restricted stock awards (in shares)	1,652,000		4,490,000
Unvested restricted stock awards, canceled (in shares)	78,000		1,076,000
Unvested restricted stock
Antidilutive shares
Antidilutive shares excluded from calculation of EPS			7,754,000	6,225,000
Stock option awards
Antidilutive shares
Antidilutive shares excluded from calculation of EPS	2,009,000	2,293,000	2,009,000	2,293,000
4.375% convertible notes due 2014 ("4.375% Convertible Notes")
Antidilutive shares
Issuance of convertible notes, interest rate (as a percent)	4.375%		4.375%