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Subsequent Events (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2012 | Jul. 31, 2012 Lenders
Line of Credit Facility [Line Items] |  |
Total lending commitment | $ 40.0 |
Subsequent Events (Textual) [Abstract] |  |
Public offering common stock | 2,645,000 |
Price per share | $ 34.75 |
Net proceeds from offering estimated | 87.1 |
Number of lenders |  | 4
Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Total lending commitment |  | 125.0
Letter of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Available for Issuance |  | 50.0

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