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
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Changes in the number of shares of common stock outstanding [Roll forward]    
Beginning Balance (in shares) 63,120,384 61,066,712
Restricted Stock Grants (in shares) 913,736 2,112,998
Other Surrenders (in shares) (301,679) (57,929)
Other (in shares) 0 (1,397)
Ending Balance (in shares) 63,732,441 63,120,384