Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - BASIC AND DILUTED EARNINGS PER SHARE (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - BASIC AND DILUTED EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accounting Policies [Abstract]        
Net income available to common stockholders $ 12,201 $ 12,273 $ 23,481 $ 19,011
Net income allocated to common stockholders (in shares) 11,333 12,403 11,553 12,428
Net income allocated to common stockholders (in dollars per share) $ 1.08 $ 0.99 $ 2.03 $ 1.53
Warrants to purchase common stock (in shares) 0 6 0 39
Non-vested restricted stock (in shares) 26 52 26 46
Net income allocated to common stockholders plus assumed conversions $ 12,201 $ 12,273 $ 23,481 $ 19,011
Net income allocated to common stockholders plus assumed conversions (in shares) 11,359 12,461 11,579 12,513
Net income allocated to common stockholders plus assumed conversions (in dollars per share) $ 1.07 $ 0.98 $ 2.03 $ 1.52