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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income available to stockholders | $ 33,735 | $ 51,430 | $ 53,689 | $ 40,270 | $ 38,007 | $ 49,651 | $ 47,783 | $ 31,928 | $ 179,124 | $ 167,369 | $ 152,149 | $ 137,664
Less: Dividends paid |  |  |  |  |  |  |  |  | (122,017) | (109,002) | (91,755) |
Undistributed earnings for the period |  |  |  |  |  |  |  |  | $ 57,107 | $ 58,367 | $ 60,394 |
Basic and diluted shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted shares outstanding (in shares) |  |  |  |  |  |  |  |  | 217,988 | 218,244 | 218,583 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.15 | $ 0.24 | $ 0.25 | $ 0.18 | $ 0.17 | $ 0.23 | $ 0.22 | $ 0.15 | $ 0.82 | $ 0.77 | $ 0.70 | $ 0.63
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Diluted (in dollars per share) | $ 0.15 | $ 0.24 | $ 0.25 | $ 0.18 | $ 0.17 | $ 0.23 | $ 0.22 | $ 0.15 | $ 0.82 | $ 0.77 | $ 0.70 | $ 0.63
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Less: Dividends paid |  |  |  |  |  |  |  |  | $ (120,930) | $ (107,880) | $ (90,631) |
Undistributed earnings for the period |  |  |  |  |  |  |  |  | $ 56,567 | $ 57,722 | $ 59,611 |
Basic and diluted shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted shares outstanding (in shares) |  |  |  |  |  |  |  |  | 215,927 | 215,831 | 215,749 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.56 | $ 0.50 | $ 0.42 |
Undistributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | 0.26 | 0.27 | 0.28 |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | 0.82 | 0.77 | 0.70 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | 0.56 | 0.50 | 0.42 |
Undistributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | 0.26 | 0.27 | 0.28 |
Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.82 | $ 0.77 | $ 0.70 |
Participating Securities |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Less: Dividends paid |  |  |  |  |  |  |  |  | $ (1,087) | $ (1,122) | $ (1,124) |
Undistributed earnings for the period |  |  |  |  |  |  |  |  | $ 540 | $ 645 | $ 783 |
Basic and diluted shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted shares outstanding (in shares) |  |  |  |  |  |  |  |  | 2,061 | 2,413 | 2,834 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.53 | $ 0.46 | $ 0.40 |
Undistributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | 0.26 | 0.27 | 0.28 |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | 0.79 | 0.73 | 0.68 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | 0.53 | 0.46 | 0.40 |
Undistributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | 0.26 | 0.27 | 0.28 |
Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.79 | $ 0.73 | $ 0.68 |

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