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Subsequent Events (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Nov. 06, 2015
Sep. 30, 2015
Sep. 30, 2014
Subsequent Event [Line Items]      
Payments for repurchase of common stock   $ 11,019 $ 0
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Payments for repurchase of common stock $ 2,320    
Subsequent Event [Member] | Richland, Washington [Member] | Mortgages [Member]      
Subsequent Event [Line Items]      
Stated interest rate 4.00%    
Debt instrument, term (in years) 10 years    
Face amount of debt instrument $ 110,000    
Subsequent Event [Member] | Richland, Washington [Member] | Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Industrial property [Member]      
Subsequent Event [Line Items]      
Proceeds from lines of credit $ 152,000    
Subsequent Event [Member] | Office Build-to-Suit Project [Member] | Charlotte, North Carolina [Member]      
Subsequent Event [Line Items]      
Lease term (years) 15 years    
Initial annual rent, percent of purchase price 8.30%    
Annual rent increase, percent 2.00%    
Contractual obligation $ 62,445    
Common Stock [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Stock repurchased during period (in shares) 288,344