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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