Annual report pursuant to Section 13 and 15(d)

STOCK???BASED COMPENSATION - Summary Of RSU Activity (Details)

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STOCK‑BASED COMPENSATION - Summary Of RSU Activity (Details) - Non-vested restricted stock units - $ / shares
12 Months Ended
Mar. 22, 2017
Sep. 30, 2013
Dec. 31, 2018
Number of Shares      
Outstanding at Beginning of Period (in shares)     688,744
Granted (in shares) 372,335 372,335 319,250
Vested (in shares)     (500,360)
Exercised (in shares)     0
Forfeited (in shares)     (34,129)
Expired (in shares)     0
Canceled (in shares)     0
Outstanding at End of Period (in shares)     473,505
Weighted Average Grant Date Fair Value      
Outstanding at Beginning of Period (in dollars per share)     $ 13.66
Granted (in dollars per share)     18.49
Vested (in dollars per share)     13.87
Exercised (in dollars per share)     0.00
Forfeited (in dollars per share)     15.99
Expired (in dollars per share)     0.00
Canceled (in dollars per share)     0.00
Outstanding at End of Period (in dollars per share)     $ 16.52