Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Long Term Incentive Plan - Share-based Compensation (Details)

v2.4.0.6
Stock Options and Long Term Incentive Plan - Share-based Compensation (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Payments of long term incentive plan and phantom stock appreciation rights $ 2,360,000 $ 27,478,000
Incentive Plan, Stock Options and Restricted Stock
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total unrecognized compensation cost for nonvested awards 89,700,000  
Weighted average period for total unrecognized compensation to be recognized over 3 years 1 month 21 days  
Long Term Incentive Plan 2006
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 4 years  
Payments of long term incentive plan and phantom stock appreciation rights 2,400,000 27,500,000
Accrued compensation related to long term incentive plan $ 800,000  
Tranche 1 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Future Vesting, Number of Shares 2,666,983.000  
Tranche 2 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Future Vesting, Number of Shares 3,363,123.000  
Share-based Comepensation, Vesting, Percentage 50.00%