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Dividend Program (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
Dividend declared (in dollars per share) | $ / shares $ 0.07
Dividend paid (in dollars per share) | $ / shares $ 0.07
Dividends | $ $ 9,851
Equity Award Plans  
Dividends | $ $ 100