Stock-Based and Other Incentive Compensation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended																		12 Months Ended		1 Months Ended		12 Months Ended		1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Stock Options Y Year	Dec. 31, 2011 Stock Options Y Year	Dec. 31, 2010 Stock Options Y	Dec. 31, 2012 Stock Options Minimum	Dec. 31, 2012 Stock Options Maximum	Dec. 31, 2012 Restricted Stock Units Y	Dec. 31, 2011 Restricted Stock Units	Dec. 31, 2010 Restricted Stock Units	Dec. 31, 2012 Restricted Stock Units Minimum	Dec. 31, 2012 Restricted Stock Units Maximum	Dec. 31, 2012 Employee stock purchase plan Class A Common Stock	Dec. 31, 2011 Employee stock purchase plan Class A Common Stock	Dec. 31, 2010 Employee stock purchase plan Class A Common Stock	Dec. 31, 2006 Employee stock purchase plan Class A Common Stock	Dec. 31, 2012 2003 Incentive Compensation Plan	Dec. 31, 2012 Asia Pacific Plan Y	Dec. 31, 2011 Asia Pacific Plan	Dec. 31, 2010 Performance conditioned equity awards Stock Options Chief Executive Officer	Dec. 02, 2010 Performance conditioned equity awards Stock Options Chief Executive Officer	Dec. 31, 2012 Performance conditioned equity awards Restricted Stock Units	Dec. 31, 2012 Performance conditioned equity awards Stock Options and Restricted Stock Units Chief Executive Officer	Dec. 31, 2010 Time vesting equity awards Restricted Stock Units Chief Executive Officer
Share-based compensation arrangement by share-based payment award
Vesting period from first anniversary of grant (in years)							4 years	5 years				4 years	5 years										four	five
Maximum term of awards (in years)				P10Y																				P10Y
Common stock authorized for awards under 2003 Incentive Compensation Plan (in shares)														1,000				13,500
The maximum employee contribution as a percentage of employee compensation														15.00%
Offering period (in months)														6 months
Effective 2007, the discount from market price on the last day of offering period (as a percent)														15.00%
Prior to 2007, the discount from market price on the lower of the closing price of stock on either the first or last day of offering period (as a percent)																	15.00%
Shares issued														85	72	81
Issue price per share														$ 7.32	$ 8.50	$ 8.25
Shares available for grant	814													357									494
Portion of awards vesting each period (as a percent)																							25.00%	20.00%
Number of Options
Options outstanding at the beginning of the period (in shares)				3,868
Granted (in shares)				30																	1,000
Exercised (in shares)				(302)
Cancelled (in shares)				(135)
Options outstanding at the end of the period (in shares)				3,461	3,868
Options exercisable at the end of the period (in shares)				964
Options expected to vest at the end of the period (in shares)				2,495
Options exercisable at the end of the period (in shares)				964
Options expected to vest at the end of the period (in shares)				2,495
Weighted Average Remaining Contract Term (Years)
Options outstanding - weighted average remaining contract term (in years)				7.8	8.3
Options exercisable - weighted average remaining contract term (in years)				7.4
Options expected to vest - weighted average remaining contract term (in years)				8.0
Weighted Average Exercise Price
Weighted average exercise price of options outstanding, beginning of period (in dollars per share)				$ 9.34	$ 9.67
Exercise price of options granted (in dollars per share)				$ 8.86																		$ 8.06
Exercise price (in dollars per share)				$ 6.76
Cancelled - weighted average exercise price (in dollars per share)				$ 24.33
Weighted average exercise price of options outstanding, end of period (in dollars per share)				$ 9.34	$ 9.67
Options exercisable - weighted average exercise price (in dollars per share)				$ 10.65
Options expected to vest - weighted average exercise price (in dollars per share)	$ 8.83
Aggregate Intrinsic Value
Aggregate intrinsic value of options outstanding, beginning of period (in dollars)				$ 659,000	$ 3,876,000
Aggregate intrinsic value of options exercised (in dollars)				479,000	0	1,276,000
Aggregate intrinsic value of options outstanding end of period (in dollars)				659,000	3,876,000
Options Exercisable - aggregate intrinsic value (in dollars)				9,000
Options expected to vest - aggregate intrinsic value (in dollars)				650,000
Weighted-average grant date fair value of options granted (in dollars per share)	$ 4.65	$ 4.10	$ 3.63
Assumptions:
Expected volatility (as a percent)				56.00%	52.00%	51.00%
Risk-free interest rate (as a percent)				1.30%	1.90%	2.60%
Dividend yield (as a percent)				0.00%	0.00%	0.00%
Expected life (in years)				6	6	6
Stock-based compensation, additional disclosures
Stock-based compensation expense recognized (in dollars)				4,300,000	6,300,000	7,300,000			19,700,000	15,200,000	15,400,000
Tax benefit recognized related to stock based compensation expenses (in dollars)				1,700,000	2,400,000	2,700,000			7,400,000	5,700,000	5,800,000
Unrecognized stock-based compensation expense relating to unvested awards that will be amortized (in dollars)				7,500,000					37,200,000
Weighted-average period of amortization (in years)				2					2
Cash received from exercise of stock options				1,300,000
Actual tax benefit realized for the tax deductions from option exercise of the stock based payment arrangements				179,000
Fair value at vesting date									14,300,000	8,600,000	7,000,000
Number of Restricted Stock Units
Unvested units outstanding at the beginning of the period (in shares)									4,771
Granted (in shares)									1,697																1,000
Vested (in shares)									(1,538)
Cancelled (in shares)									(115)
Unvested units outstanding at the end of the period (in shares)									4,815	4,771
Weighted Average Grant Date Fair Value
Unvested units outstanding at the beginning of the period (in dollars per share)									$ 10.49
Granted (in dollars per share)									$ 12.23	$ 8.52	$ 12.74
Vested (in dollars per share)									$ 11.24
Cancelled (in dollars per share)									$ 12.10
Unvested units outstanding at the end of the period (in dollars per share)									$ 10.53	$ 10.49
Period under consideration for share based compensation																			4
Maximum compensation with liquidity event not occuring																			35,000,000
Maximum compensation with liquidity event occuring																			50,000,000
Liquidity percentage change																			20.00%
Compensation amount accrued																			$ 1,900,000	$ 4,300,000