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Shareholders' Equity (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Aug. 31, 2008
Stock Repurchase Plan [Member]
Dec. 31, 2013
Stock Repurchase Plan [Member]
Dec. 31, 2008
Stock Repurchase Plan of 2004 [Member]
Dividends Available for Distribution $ 56,210          
Number of shares approved for repurchase       300,000   310,000
Stock repurchase program, percentage       10.20%   10.00%
Stock repurchase program, authorized durational period       24 months    
Stock repurchased during period, shares         104,952 288,799
Treasury stock acquired, average cost per share $ 27.98         $ 29.23
Stock repurchased during period, value $ 24 $ 181 $ 623   $ 2,937 $ 8,441