Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Narrative) (Details)

v2.4.0.6
Share-Based Compensation (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Total Share-based Liabilities Paid $ 1,100,000 $ 500,000 $ 0
Phantom shares vested 277,701 201,876  
Total liability for share awards 16,200,000 10,900,000  
Compensation costs 6,400,000 4,200,000 4,400,000
Unrecognized compensation cost 3,700,000    
Phantom Stock Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 111,661    
Maximum number of shares of phantom stock available for awards 843,750    
Director Phantom Stock Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 10,125    
Phantom shares annual award   50,000 30,000
Other Phantom Stock Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 4,481    
Compensation costs $ 129,000    
2012 Phantom Stock Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares of phantom stock available for awards 1,000,000