Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified			1 Months Ended	3 Months Ended				9 Months Ended			9 Months Ended	1 Months Ended	9 Months Ended	1 Months Ended						3 Months Ended				9 Months Ended		1 Months Ended	9 Months Ended		1 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Aug. 31, 2011 Stock Options	Sep. 30, 2011 Stock Options Year	Jun. 30, 2011 Stock Options Year	Mar. 31, 2011 Stock Options Year	Sep. 30, 2010 Stock Options	Sep. 30, 2011 Stock Options Year	Sep. 30, 2010 Stock Options	Dec. 31, 2010 Stock Options Year	Sep. 30, 2011 Stock Options Performance-conditioned awards	Aug. 31, 2011 Stock Options Performance-conditioned awards Chief Executive Officer	Sep. 30, 2011 Stock Options Performance-conditioned awards Chief Executive Officer	Jan. 31, 2011 Stock Options Performance-conditioned awards Officers	Jan. 31, 2011 Stock Options Time-vesting equity awards Officers Year	Aug. 31, 2011 Stock Options Chief Executive Officer	Dec. 31, 2010 Stock Options Chief Executive Officer Year	Aug. 31, 2011 Stock Options Officers	Jan. 31, 2011 Stock Options Officers	Sep. 30, 2011 Restricted Stock Units Year	Jun. 30, 2011 Restricted Stock Units	Mar. 31, 2011 Restricted Stock Units	Sep. 30, 2010 Restricted Stock Units	Sep. 30, 2011 Restricted Stock Units Installment	Sep. 30, 2010 Restricted Stock Units	Aug. 31, 2011 Restricted Stock Units Performance-conditioned awards Chief Executive Officer	Sep. 30, 2011 Restricted Stock Units Performance-conditioned awards Chief Executive Officer	Sep. 30, 2011 Restricted Stock Units Time-vesting equity awards	Aug. 31, 2011 Restricted Stock Units Chief Executive Officer	Dec. 31, 2010 Restricted Stock Units Chief Executive Officer	Sep. 30, 2011 Restricted Stock Units Chief Executive Officer	Sep. 30, 2011 Employee stock purchase plan	Dec. 31, 2010 Employee stock purchase plan	Jul. 19, 2011 Minimum Eligible employees and directors
Share-based compensation arrangement by share-based payment award
Shares available for grant (in shares)	1,334	2,119																														480	514
Number of options
Options outstanding at the beginning of the period (in shares)				7,163,000	7,196,000	6,751,000		6,751,000
Granted (in shares)				1,720,000	20,000	754,000								113,000					475,000
Exercised (in shares)					(2,000)	(2,000)
Cancelled (in shares)				(4,967,000)	(51,000)	(307,000)
Options outstanding at the end of the period (in shares)				3,916,000	7,163,000	7,196,000		3,916,000
Options granted (in shares)													1,000				1,000
Options exercisable at the end of the period (in shares)				551				551					1,000				1,000										1,000			1,000
Weighted average remaining contract term
Options outstanding - weighted average remaining contract term (in years)				8.2	6.1	6.4		8.2		6.0
Options exercisable - weighted average remaining contract term (in years)				1.7
Weighted average exercise price per share
Exercise price of options granted (in dollars per share)													$ 8.06				$ 9.00
Exercise price (in dollars per share)																																		$ 11.99
Weighted average exercise price of options outstanding (in dollars per share)				$ 9.72	$ 19.41	$ 19.42		$ 9.72		$ 20.72
Options exercisable - weighted average exercise price (in dollars per share)				$ 14.26				$ 14.26
Aggregate intrinsic value
Aggregate intrinsic value of options exercised (in dollars)					$ 11	$ 15
Aggregate intrinsic value of options outstanding (in dollars)				150	3,288	654		150		1,814
Weighted-average grant date fair value of options granted (in dollars per share)				$ 3.90	$ 4.61	$ 4.62
Options Exercisable - aggregate intrinsic value (in dollars)				150				150
Compensation expense, tax benefit and unearned compensation
Stock-based compensation expense recognized (in dollars)				4,900			1,800	1,500	5,800											4,100			3,000	10,300	11,500
Tax benefit recognized related to stock based compensation expenses (in dollars)				1,800			700	600	2,300											1,600			1,200	3,900	4,500
Unearned compensation expense that will be amortized (in dollars)				$ 12,000				$ 12,000												$ 42,000				$ 42,000
Weighted-average period of amortization (in years)				2																2
Number of restricted shares
Non-vested units outstanding at the beginning of the period (in shares)																				2,821,000	2,859,000	2,440,000		2,440,000
Granted (in shares)																				2,305,000	32,000	917,000					1,000			1,000
Vested (in shares)																				(22,000)	(44,000)	(482,000)
Cancelled (in shares)																				(52,000)	(26,000)	(16,000)
Non-vested units outstanding at the end of the period (in shares)																				5,052,000	2,821,000	2,859,000		5,052,000
Weighted Average Grant Date Fair Value
Maximum term of grant (in years)								10							10		10
Non-vested units outstanding at the beginning of the period (in dollars per share)																				$ 12.34	$ 12.58	$ 15.13		$ 15.13
Granted (in dollars per share)																				$ 8.38	$ 9.47	$ 8.92
Vested (in dollars per share)																				$ 18.31	$ 25.31	$ 18.43
Cancelled (in dollars per share)																				$ 13.10	$ 13.66	$ 15.52		$ 13.10
Non-vested units outstanding at the end of the period (in dollars per share)																				$ 10.50	$ 12.34	$ 12.58		$ 10.50
Exercisable period, minimum (in years)								4
Exercisable period, maximum (in years)								5
Number of installments for vesting of RSUs, minimum																								4
Number of installments for vesting of RSUs, maximum																								5
Common stock authorized for awards under 2003 Incentive Compensation Plan	13,500
Approximate percentage of premium to the market value of the entity's stock																	12.00%
Vesting period (in years)																											5Y			4Y
Portion of awards vesting each period (as a percent)													20.00%														20.00%				25.00%
Number of shares to be settled in cash due to unavailability of sufficient shares under the plan for the delivery of the shares issuable upon exercise (in shares)											200																	500
Number of awards for which cash settlement obligation was eliminated (in shares)																200													500
Options exchanged as a percentage of options eligible for exchange			97.00%
Grants in period with a specified exercise price (in shares)															363
Number of awards for which non-exercisability and forfeiture provisions were eliminated												1,000						475								1,000
Additional grants in period with a specified exercise price (in shares)															250
Number of options exchanged and cancelled (in shares)			4,918
Grants in period with a specified exercise price (in dollars per share)															$ 10.02
Additional grants in period with a specified exercise price (in dollars per share)															$ 9.98