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Stockholders' Equity - Stock Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Aug. 15, 2019
Aug. 14, 2019
Stockholders’ Equity            
Average purchase price per share for share repurchase (in dollars per share)     $ 16.55 $ 17.82    
Aggregate cost     $ 18,794 $ 93,369    
Additional authorized repurchase amount         $ 64,200  
Remaining authorized repurchase amount $ 88,300   $ 88,300   $ 100,000 $ 35,800
Common Stock            
Stockholders’ Equity            
Shares repurchased during the period (in shares) 670,029 1,173,406 1,141,529 5,238,566