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Level 4 Deferred Compensation Plan (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred Compensation Plans [Line Items]      
Deferred compensation plan description Under the plan, participating employees irrevocably elect each year to defer receipt of a portion of their base salary and incentive compensation. A participant's account is credited with imputed interest at a rate equal to 130% of Moody's Composite Average of Yields on Corporate Bonds. Participants may receive payment of their deferred compensation plan balance in a lump sum or in monthly installments over a specified period of years following the termination of their employment with the company.    
Interest expense $ 20,426,000 $ 21,757,000 $ 18,987,000
Deferred compensation liability 10,900,000 10,900,000  
Accrued liabilities compensation and benefits [Member]
      
Deferred Compensation Plans [Line Items]      
Deferred compensation liability 1,800,000 1,100,000  
Other compensation and benefits [Member]
      
Deferred Compensation Plans [Line Items]      
Deferred compensation liability 9,100,000 9,800,000  
Deferred compensation arrangement with individual [Member]
      
Deferred Compensation Plans [Line Items]      
Interest expense $ 600,000 $ 600,000 $ 700,000