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EQUITY-BASED COMPENSATION - Restricted Stock and Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 33 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2014 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2014 | Jun. 30, 2017 | Nov. 09, 2014
Restricted stock and RSUs |  |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |  |
Unvested Balance at the beginning of the period (in shares) |  |  |  | 8,504,190 | 5,123,481 |  |  |
Granted (in shares) |  |  |  | 3,027,744 | 3,561,401 |  |  |
Forfeited (in shares) |  |  |  | (61,633) | (33,559) |  |  |
Vested (in shares) |  |  |  | (2,035,782) | (472,954) |  |  |
Unvested Balance at the end of the period (in shares) |  | 9,434,519 | 8,178,369 | 9,434,519 | 8,178,369 |  | 9,434,519 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Unvested Balance at the beginning of the period (in dollars per share) |  |  |  | $ 26.70 | $ 28.67 |  |  |
Granted (in dollars per share) |  |  |  | 37.05 | 24.07 |  |  |
Forfeited (in dollars per share) |  |  |  | 29.99 | 26.95 |  |  |
Vested (in dollars per share) |  |  |  | 26.73 | 28.07 |  |  |
Unvested Balance at the end of the period (in dollars per share) |  | $ 29.89 | $ 26.86 | $ 29.89 | $ 26.86 |  | $ 29.89 |
Total compensation expense not yet recognized |  | $ 137,792 |  | $ 137,792 |  |  | $ 137,792 |
Weighted average period to recognize compensation expense |  |  |  | 1 year 10 months 24 days |  |  |  |
RSUs |  |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |  |
Compensation expenses |  | 22,727 | $ 19,942 | $ 47,190 | $ 34,795 |  |  |
RSUs | Minimum |  |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |  |  |
RSUs | Maximum |  |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |  |
Vesting period |  |  |  | 5 years |  |  |  |
Stock options |  |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 5 years |  |
Compensation expenses |  | 588 | $ 1,335 | $ 1,340 | $ 2,278 |  |  |
Weighted average remaining period for recognition of unrecognized compensation cost |  |  |  | 1 year 7 months 6 days |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Total compensation expense not yet recognized |  | $ 4,430 |  | $ 4,430 |  |  | $ 4,430 |
Assumptions used to estimate fair value |  |  |  |  |  |  |  |
Expected life (in years) |  |  |  | 6 years |  |  |  |
Weighted-average risk free interest rate (as a percent) |  |  |  | 1.91% |  |  |  |
Expected volatility (as a percent) |  |  |  | 35.00% |  |  |  |
Dividend yield (as a percent) |  |  |  | 2.72% |  |  |  |
Weighted - average fair value at grant date |  |  |  | $ 6.70 |  |  |  |
Special dividends paid (in dollars per share) |  |  |  |  |  |  | $ 4.05 |
Reduction to exercise price of options outstanding due to special dividend paid (in dollars per share) |  |  |  |  |  |  | 4.05 |
Exercise price (in dollars per share) |  | $ 20.95 |  | $ 20.95 |  |  | $ 20.95 | $ 25.00
Number Outstanding |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares |  |  |  | 2,822,728 | 3,081,203 |  |  |
Grants (in shares) | 3,501,881 |  |  |  |  |  |  |
Exercises (in shares) |  |  |  | (243,077) |  |  |  |
Forfeiture or expirations (in shares) |  |  |  | (72,000) | (124,000) |  |  |
Outstanding at the end of the period (in shares |  | 2,507,651 | 2,957,203 | 2,507,651 | 2,957,203 |  | 2,507,651 |
Weighted-Average Exercise Price Per Share |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  | $ 20.95 | $ 20.95 |  |  |
Exercises (in dollars per share) |  |  |  | 20.95 |  |  |  |
Forfeiture or expirations (in dollars per share) |  |  |  | 20.95 | 20.95 |  |  |
Outstanding at the end of the period (in dollars per share) |  | $ 20.95 | $ 20.95 | $ 20.95 | $ 20.95 |  | $ 20.95 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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