NET INCOME PER COMMON SHARE - Components of Computation of Basic and Diluted Net Income per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended |
Mar. 31, 2018 |
Mar. 31, 2017 |
| Numerator for basic net income per common share [Abstract] |
|
|
| Net income |
$ 19,420
|
$ 22,701
|
| Preferred stock dividends |
(4,842)
|
(3,864)
|
| Earnings participation of unvested equity awards |
(32)
|
(40)
|
| Numerator for basic net income per common share |
$ 14,546
|
$ 18,797
|
| Denominator for basic net income per common share [Abstract] |
|
|
| Average number of shares of common stock outstanding (in shares) |
93,867
|
96,061
|
| Average unvested stock awards outstanding (in shares) |
(442)
|
(306)
|
| Denominator for basic net income per common share (in shares) |
93,425
|
95,755
|
| Basic net income per common share (in dollars per share) |
$ 0.16
|
$ 0.20
|
| Numerator for diluted net income per common share [Abstract] |
|
|
| Numerator for basic net income per common share |
$ 14,546
|
$ 18,797
|
| Denominator for diluted net income per common share [Abstract] |
|
|
| Denominator for basic net income per common share (in shares) |
93,425
|
95,755
|
| Net effect of dilutive equity awards (in shares) |
81
|
120
|
| Denominator for diluted net income per common share (in shares) |
93,506
|
95,875
|
| Diluted net income per common share (in dollars per share) |
$ 0.16
|
$ 0.20
|