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Equity-Based Compensation (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized (in shares) 367,000   367,000  
Realized tax benefits related to compensation cost $ 0 $ 0 $ 0 $ 0
Unvested stock options outstanding (in shares)     0  
Aggregate intrinsic value of stock options exercised     679,000 1,300,000
Cash received from stock options exercises     709,000 1,230,000
Tax benefits realized from option exercises     0 0
Performance shares [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost 4,200,000   4,200,000  
Weighted average period (in years)     1 year 3 months 0 days  
Restricted stock units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value of RSU awards vested     100,000  
Unrecognized compensation cost $ 800,000   $ 800,000  
Weighted average period (in years)     1 year 3 months 18 days