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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
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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

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