XML 120 R41.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary Of Significant Accounting Policies (Reconciliation Between Basic And Diluted Weighted Average Shares Outstanding) (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
Summary Of Significant Accounting Policies [Abstract]                      
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 attributable to unvested awarded performance stock                 (5,099) (5,097) (4,937)
Net income attributable to common shares                 $ 158,896 $ 156,655 $ 148,357
Weighted average basic number of common shares outstanding                 143,029 142,412 141,738
Less unvested awarded performance stock included in weighted average basic share outstanding                 (4,447) (4,488) (4,565)
Weighted average number of common shares outstanding for basic earnings per common share                 138,582 137,924 137,173
Dilutive effect of stock options                 1,682 1,394 334
Weighted average number of shares outstanding                 140,264 139,318 137,507
Basic $ 0.25 $ 0.31 $ 0.26 $ 0.32 $ 0.23 $ 0.31 $ 0.29 $ 0.31 $ 1.15 $ 1.14 $ 1.08
Diluted $ 0.25 $ 0.30 $ 0.26 $ 0.32 $ 0.22 $ 0.31 $ 0.29 $ 0.31 $ 1.13 $ 1.12 $ 1.08