Quarterly report pursuant to Section 13 or 15(d)

COMMON AND PREFERRED STOCK - Changes in Equity (Details)

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COMMON AND PREFERRED STOCK - Changes in Equity (Details) - shares
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2015
Changes in the number of shares of common stock outstanding [Roll forward]    
Beginning Balance (in shares) 63,259,781  
Restricted Stock Grants (in shares) 848,562 2,109,814
Other Surrenders (in shares) (200,932) (375,875)
Other (in shares) (85,383) (1,594,542)
Ending Balance (in shares) 63,822,028 63,120,384