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Shareholders' Equity (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Agreements [Line Items] |  |  |
Common stock reserved for future issuance | $ 200,000,000 |  |
Net proceeds from equity offerings | $ 5,215,000 | $ 30,690,000 | $ 0
Common Stock [Member] |  |  |
Financing Agreements [Line Items] |  |  |
Stock issued during period (in shares) | 184,000 | 1,125,000 | 0
common stock, weighted average issued price | $ 28.34 | $ 27.86 |
Net proceeds from equity offerings | $ 5,200,000 | $ 30,700,000 |
Shares issued under dividend reinvestment plan | 0 |  |

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