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Dividend Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dividend declared (in dollars per share) $ 0.07 $ 0.21
Dividend paid (in dollars per share) $ 0.07 $ 0.21
Dividends $ 2,300 $ 6,916
Equity Award Plans    
Dividends $ 100 $ 100