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Stockholders' Equity and Share-Based Compensation (Details) (USD $)
12 Months Ended 12 Months Ended 0 Months Ended 29 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Minimum
Dec. 31, 2013
Maximum
Dec. 31, 2013
Stock Compensation Plan
Aug. 03, 2011
Stock Compensation Plan
Aug. 03, 2011
Awards Other than Options and Stock Appreciation Rights
Dec. 31, 2013
Restricted Stock Units (RSUs)
Dec. 31, 2012
Restricted Stock Units (RSUs)
Dec. 31, 2011
Restricted Stock Units (RSUs)
Aug. 03, 2011
ESPP Purchase Right
Dec. 31, 2013
ESPP Purchase Right
Dec. 31, 2013
Stock Options
Dec. 31, 2012
Stock Options
Dec. 31, 2011
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares authorized under the plan         17,750,000                  
Stock Incentive Plan [Abstract]                            
Multiplier for awards other than stock options and SARs           2.22                
Hypothetical restricted stock award grant         1,000         1,000        
Hypothetical number of shares reserved from plan if multiplier is applied to grant of shares         2,220                  
Number of shares available for issuance under the plan       10,073,593           2,500,000 1,216,281      
Contribution per employee, percent                   10.00%        
Percentage of lower of the fair value market value per share on the commencement date or purchase date                   85.00%        
Number of shares issued under ESPP                     1,283,719      
Award vesting period             3 years         4 years    
Award contractual term   7 years 10 years                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]                            
Outstanding at December 31, 2012 (shares)                       5,908,000    
Granted (shares)                       2,158,000    
Exercised (shares)                       (766,000)    
Expired/Forfeited (shares)                       (637,000)    
Outstanding at December 31, 2013 (shares)                       6,663,000 5,908,000  
Vested and expected to vest at December 31, 2013 (shares)                       6,100,000    
Exercisable at December 31, 2013 (shares)                       3,086,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]                            
Weighted Average Exercise Price, Outstanding at December 31, 2012                       $ 7.23    
Weighted Average Exercise Price, Granted                       $ 9.07    
Weighted Average Exercise Price, Exercised                       $ 6.67    
Weighted Average Exercise Price, Expired/ Forfeited                       $ 8.20    
Weighted Average Exercise Price, Outstanding at December 31, 2013                       $ 7.80 $ 7.23  
Vested and expected to vest at December 31, 2013, Weighted Average Exercise Price                       $ 7.71    
Exercisable at December 31, 2013, Weighted Average Exercise Price                       $ 6.91    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                            
Outstanding at December 31, 2013 (Aggregate Intrinsic Value)                       $ 12,492,000    
Outstanding, Weighted Average Remaining Contractual Life                       7 years 5 months 26 days    
Vested and expected to vest at December 31, 2013, Aggregate Intrinsic Value                       12,027,000    
Vested and expected to vest at December 31, 2013, Weighted Average Remaining Contractual Term                       7 years 3 months 29 days    
Exercisable at December 31, 2013 (Aggregate Intrinsic Value)                       8,960,000    
Exercisable, Weighted Average Remaining Contractual Life                       5 years 8 months 12 days    
Common stock, price at market close                       $ 9.54    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                            
Unvested at December 31, 2012 (shares)             1,653,000              
Granted (shares)             750,000              
Vested (shares)             (728,000)              
Forfeited (shares)             (307,000)              
Unvested at December 31, 2013 (shares)             1,368,000 1,653,000            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                            
Unvested at December 31, 2012 (Weighted Average Grant Date Fair Value)             $ 7.53              
Granted (Weighted Average Grant Date Fair Value)             $ 9.07              
Vested (Weighted Average Grant Date Fair Value)             $ 7.42              
Forfeited (Weighted Average Grant Date Fair Value)             $ 7.44              
Unvested at December 31, 2013 (Weighted Average Grant Date Fair Value)             $ 8.46 $ 7.53            
Total intrinsic value of stock options exercised in the period 2,000,000                       2,000,000 1,000,000
Shares tendered for minimum income tax obligations upon vesting of RSUs             219,651              
Total fair value of RSUs vested in period             $ 6,800,000 $ 3,800,000 $ 3,000,000