Share-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended					12 Months Ended									12 Months Ended		12 Months Ended								12 Months Ended						12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009 employees	Dec. 31, 2001 years	Jan. 31, 2011	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2009 Stock Options [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2010 Restricted Stock [Member]	Dec. 31, 2009 Restricted Stock [Member]	Dec. 31, 2011 Unvested Restricted Stock And RSUs [Member]	Dec. 31, 2010 Unvested Restricted Stock And RSUs [Member]	Dec. 31, 2009 Unvested Restricted Stock And RSUs [Member]	Dec. 31, 2001 2001 Stock Option Plan [Member]	Dec. 31, 2011 2001 Stock Option Plan [Member]	Dec. 31, 2011 2004 Incentive Plan [Member]	Dec. 31, 2010 2004 Incentive Plan [Member]	Dec. 31, 2009 2004 Incentive Plan [Member]	Dec. 31, 2011 Stock Options Awards That Contain Performance Or Market Conditions [Member]	Dec. 31, 2010 Stock Options Awards That Contain Performance Or Market Conditions [Member]	Dec. 31, 2011 Restricted Stock Awards That Contain Performance Or Market Conditions [Member]	Dec. 31, 2010 Restricted Stock Awards That Contain Performance Or Market Conditions [Member]	Dec. 31, 2009 Restricted Stock Awards That Contain Performance Or Market Conditions [Member]	Dec. 31, 2011 Employee Stock Purchase Plan [Member]	Dec. 31, 2010 Employee Stock Purchase Plan [Member]	Dec. 31, 2009 Employee Stock Purchase Plan [Member]	Dec. 31, 2011 2011 Incentive Plan [Member]	Apr. 29, 2011 Second Inducement [Member]	Apr. 29, 2011 Third Inducement [Member]	Dec. 31, 2011 Directors [Member] Restricted Stock [Member]	Dec. 31, 2011 Directors [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2001 Incentive Stock Options [Member] 2001 Stock Option Plan [Member]	Dec. 31, 2001 Non-Qualified Stock Options [Member] 2001 Stock Option Plan [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Percentage of fair value of underlying shares on the date of grant																																	100.00%	85.00%
Shares authorized to purchase upon grant of options					250,000											10,000,000													50,000	50,000
Unexercised options expiration period or after termination of employment, years				10
Stock options vesting period																															one	one-year and thirty-one days
Minimum vesting period, years									one						two
Maximum vesting period, years									four						four
Income tax benefit recognized for share-based compensation	$ 0	$ 0	$ 0
Shares remain available for future grant																												6,252,099
Exercise of stock options and the vesting of restricted stock, income tax deduction	1,800,000
Stock compensation expense	4,583,000	3,410,000	4,065,000														7,105,000	7,444,000	6,644,000
Term of options granted from grant date, years						10														10		10
Employee options to purchase shares of common stock	2,234,000																			450,000					155,097	29,738	80,995
Common stock issued upon exercise of outstanding stock options	33,000	273,000	1,110,000																									7,750,000
Common stock issued upon exercise of outstanding stock options, proceeds	200,000	1,800,000	6,700,000
Stock option compensation cost charged against operations						3,200,000	2,300,000	4,000,000	2,600,000	2,100,000	2,700,000									600,000	800,000	700,000	2,300,000		800,000	300,000	100,000
Unrecognized compensation cost	5,900,000								4,000,000
Unamortized stock option compensation, expected to be recognized over a weighted-average period, years	2.7
Total intrinsic value of options exercised						100,000	2,300,000	6,900,000
Closing price of common stock						$ 2.23	$ 11.14	$ 13.61
Employee reduction in workforce			34
Termination charges incurred			1,100,000
Options remain unvested	440,000								811,000			811,000	315,000	500,000								306,000	39,000	217,000
Additional compensation expense if the performance targets are met or expected to be attained	700,000																					2,100,000
Shares of restricted stock issued	300,000		168,000						856,000	43,000	244,000
Weighted-average grant date per share fair value granted	$ 9.23		$ 13.56
Total aggregate fair market value of restricted stock issued	2,800,000		2,300,000						7,100,000	500,000	2,300,000
Weighted-average grant date fair value for restricted stock awards granted									$ 8.35	$ 11.72	$ 9.28	$ 8.75	$ 11.56	$ 10.55								$ 9.44	$ 19.37	$ 14.67
Number of shares vested during the period												268,000	222,000									7,000	161,000
Total fair value of restricted stock and restricted stock units vested									1,600,000	2,800,000	3,600,000
Rights purchase price, percentage of fair value of rights granted or exercised, not less than																									85.00%
Employee stock purchase plan minimum purchase discount, percentage	5.00%
Additional paid-in-capital excess tax benefit pool available to absorb future tax deficiencies	$ 2,500,000
Award vesting period																															one	one-year and thirty-one days