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Organization and Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Summary of fair value of subordinated notes    
Net carrying amount of the liability component $ 850,191 $ 779,878
7.75% senior subordinated notes due 2016 [Member]
   
Summary of fair value of subordinated notes    
Net carrying amount of the liability component 375,000 375,000
Net fair amount of the liability component 385,313 380,063
3.5% senior subordinated convertible notes due 2026 [Member]
   
Summary of fair value of subordinated notes    
Net carrying amount of the liability component 63,324 148,884
Net fair amount of the liability component $ 61,029 $ 150,602