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Equity-Based Compensation (Other Narrative) (Details) (USD $)
12 Months Ended 12 Months Ended
Dec. 31, 2011
years
months
Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
years
Dec. 31, 2010
Stock Appreciation Rights (SARs) [Member]
Vest After One Year [Member]
Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
Vest Annually In Each Of First Four Anniversaries [Member]
Dec. 31, 2010
Stock Appreciation Rights (SARs) [Member]
Vest Annually In Each Of First Four Anniversaries [Member]
Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
Vest On Third, Fourth And Fifth Anniversary [Member]
Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
Vest On Third Anniversary [Member]
Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
Vest On Fourth Anniversary [Member]
Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
Vest On Fifth Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares expected to vest   16,045 18,000 371,802 474,382 120,299      
Shares expected to vest, percentage             25.00% 25.00% 50.00%
Expiration period (in years)   10              
Unearned compensation costs related to awards granted $ 17,895,000                
Unearned compensation cost, expected to be recognized over period (years) 2.4                
Expected minimum life of employee stock purchase plan (in months) 3                
Expected maximum life of employee stock purchase plan (in years) 1