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Sale of Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 0 Months Ended 1 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Apr. 25, 2013
Underwritten Public Offering [Member]
Common Stock [Member]
Apr. 03, 2013
Underwritten Public Offering [Member]
Common Stock [Member]
Apr. 29, 2013
Underwritten Public Offering [Member]
Common Stock [Member]
Common shares issued         1,321,000  
Common stock, par value $ 0.521   $ 0.521   $ 0.521  
Public offering price per share         $ 26.50  
Share price to underwriters         $ 25.44  
Length of option period to purchase overallotment of shares         30 days  
Shares included in overallotment option         198,150  
Shares issued upon exercise of overallotment option       100,000    
Proceeds from issuance of common shares $ 35,894 $ 0       $ 35,894