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Quarterly Operating Results (Schedule Of Quarterly Operating Results) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Quarterly Operating Results [Abstract]                      
Total revenues $ 244,097 $ 260,401 $ 246,816 $ 262,228 $ 229,938 $ 247,616 $ 243,665 $ 252,273 $ 1,013,542 $ 973,492 $ 967,877
Total expenses 184,406 187,709 185,348 185,558 177,971 174,582 175,652 179,189 743,021 707,394 713,123
Income before income taxes 59,691 72,692 61,468 76,670 51,967 73,034 68,013 73,084 270,521 266,098 254,754
Net income $ 36,494 $ 44,173 $ 37,035 $ 46,293 $ 32,146 $ 44,293 $ 41,185 $ 44,128 $ 163,995 $ 161,752 $ 153,294
Net income per share: Basic $ 0.25 $ 0.31 $ 0.26 $ 0.32 $ 0.23 $ 0.31 $ 0.29 $ 0.31 $ 1.15 $ 1.14 $ 1.08
Net income per share: Diluted $ 0.25 $ 0.30 $ 0.26 $ 0.32 $ 0.22 $ 0.31 $ 0.29 $ 0.31 $ 1.13 $ 1.12 $ 1.08