CONDENSED CONSOLIDATED STATEMENT OF EQUITY (unaudited) (USD $) In Thousands, except Share data	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2011
Balances, at beginning of period		$ 1,059,997	$ 1,068,629
Balances, at beginning of period (in shares)		124,316,545	124,408,574
Compensation expense related to restricted stock and restricted stock unit grants	4,555	9,095
Net loss	(33,959)	(46,264)
Equity component of convertible notes, net		76,835
Purchase of bond hedge	(77,007)	(77,007)
Issuance of warrants	45,066	45,066
Issuance of common stock under Associate Stock Purchase Plan		520
Restricted stock, net		0
Unrealized (loss) gain on marketable securities - restricted		221
Reclassification of net gains on derivatives into earnings	114	228
Amortization of payments from settlement of forward interest rate swaps	94	188
Other		(250)
Common Stock [Member]
Balances, at beginning of period		1,243	1,244
Balances, at beginning of period (in shares)		124,317,000	124,409,000
Compensation expense related to restricted stock and restricted stock unit grants		0
Net loss		0
Equity component of convertible notes, net		0
Purchase of bond hedge	0	0
Issuance of warrants	0	0
Issuance of common stock under Associate Stock Purchase Plan		0
Issuance of common stock under Associate Stock Purchase Plan (in shares)		22,000
Restricted stock, net		1
Restricted stock, net (in shares)		70,000
Unrealized (loss) gain on marketable securities - restricted		0
Reclassification of net gains on derivatives into earnings		0
Amortization of payments from settlement of forward interest rate swaps		0
Other		0
Additional Paid-in Capital [Member]
Balances, at beginning of period		1,904,144	1,958,652
Compensation expense related to restricted stock and restricted stock unit grants		9,095
Net loss		0
Equity component of convertible notes, net		76,835
Purchase of bond hedge	(77,007)	(77,007)
Issuance of warrants	45,066	45,066
Issuance of common stock under Associate Stock Purchase Plan		520
Restricted stock, net		(1)
Unrealized (loss) gain on marketable securities - restricted		0
Reclassification of net gains on derivatives into earnings		0
Amortization of payments from settlement of forward interest rate swaps		0
Other		0
Treasury Stock [Member]
Balances, at beginning of period		(29,187)	(29,187)
Compensation expense related to restricted stock and restricted stock unit grants		0
Net loss		0
Equity component of convertible notes, net		0
Purchase of bond hedge	0	0
Issuance of warrants	0	0
Issuance of common stock under Associate Stock Purchase Plan		0
Restricted stock, net		0
Unrealized (loss) gain on marketable securities - restricted		0
Reclassification of net gains on derivatives into earnings		0
Amortization of payments from settlement of forward interest rate swaps		0
Other		0
Retained Earnings [Member]
Balances, at beginning of period		(815,876)	(862,140)
Compensation expense related to restricted stock and restricted stock unit grants		0
Net loss		(46,264)
Equity component of convertible notes, net		0
Purchase of bond hedge	0	0
Issuance of warrants	0	0
Issuance of common stock under Associate Stock Purchase Plan		0
Restricted stock, net		0
Unrealized (loss) gain on marketable securities - restricted		0
Reclassification of net gains on derivatives into earnings		0
Amortization of payments from settlement of forward interest rate swaps		0
Other		0
Accumulated Other Comprehensive Income (Loss) [Member]
Balances, at beginning of period		(327)	60
Compensation expense related to restricted stock and restricted stock unit grants		0
Net loss		0
Equity component of convertible notes, net		0
Purchase of bond hedge	0	0
Issuance of warrants	0	0
Issuance of common stock under Associate Stock Purchase Plan		0
Restricted stock, net		0
Unrealized (loss) gain on marketable securities - restricted		221
Reclassification of net gains on derivatives into earnings		228
Amortization of payments from settlement of forward interest rate swaps		188
Other		$ (250)