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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Nov. 08, 2017
Oct. 27, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Subsequent Event [Line Items]                    
Dividends declared per share (in usd per share)     $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.05 $ 0.18 $ 0.17
Repayments of Long-term Debt                 $ 1,142 $ 969
Subsequent Event                    
Subsequent Event [Line Items]                    
Dividends declared per share (in usd per share) $ 0.06                  
Subsequent Event | Interboro, LLC Promissory Note                    
Subsequent Event [Line Items]                    
Interest Expense, Long-term Debt   $ 767                
Repayments of Long-term Debt   $ 8,550