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Business Combinations (Results Of Operations) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Business Acquisition [Line Items]      
Weighted average number of shares outstanding, basic 138,582 137,924 137,173
Weighted average number of shares outstanding, diluted 140,264 139,318 137,507
2011 Acquisitions [Member]
      
Business Acquisition [Line Items]      
Total revenues 1,058,142 1,059,857  
Income before income taxes 283,404 291,944  
Net income 171,805 177,464  
Net income per share, Basic 1.20 1.25  
Net income per share, Diluted 1.19 1.23  
Weighted average number of shares outstanding, basic 138,582 137,924  
Weighted average number of shares outstanding, diluted 140,264 139,318  
2010 Acquisitions [Member]
      
Business Acquisition [Line Items]      
Total revenues   1,015,043 1,035,286
Income before income taxes   278,635 274,908
Net income   169,373 165,420
Net income per share, Basic   1.19 1.17
Net income per share, Diluted   1.18 1.16
Weighted average number of shares outstanding, basic   137,924 137,173
Weighted average number of shares outstanding, diluted   139,318 137,507