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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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STOCK BASED AND OTHER COMPENSATION PLANS - Additional Information (Details)																	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 24, 2018 USD ($) anniversary installment shares	Feb. 18, 2018 USD ($) shares	Dec. 21, 2017 USD ($) installment shares	Jun. 22, 2017 USD ($) anniversary installment shares	Jun. 19, 2017 USD ($) shares	Mar. 03, 2017 USD ($) anniversary installment shares	Feb. 18, 2017	Feb. 18, 2017	Feb. 18, 2017 USD ($)	Feb. 18, 2017 shares	Feb. 18, 2017 anniversary	Feb. 18, 2017 Vesting_Installment	Feb. 18, 2017 installment	Jan. 24, 2017 USD ($) shares	Feb. 18, 2016 USD ($) anniversary Vesting_Installment installment shares	Mar. 17, 2015	Jun. 30, 2018 USD ($) shares	Jun. 30, 2017 USD ($) shares	Jun. 30, 2018 USD ($) shares	Jun. 30, 2017 USD ($) shares	Dec. 31, 2017 USD ($) shares	Jan. 05, 2018 USD ($)	Dec. 29, 2017 USD ($)	Dec. 19, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of recognition for unrecognized compensation costs																			34 months	37 months
Unrecognized compensation cost																	$ 10,300,000	$ 9,200,000	$ 10,300,000	$ 9,200,000
Weighted average remaining vesting period																			23 months 1 day	24 months
Accrued bonuses																					$ 39,500,000			$ 49,300,000
Bonus payment allocated to equity based compensation			$ 15,500,000																		$ 10,200,000
Compensation bonus																						$ 16,800,000	$ 17,100,000
Bonus expense																	2,105,000	1,512,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted (in shares) \| shares																			28,936	874,621
Bonus expense																	2,105,000	1,512,000	$ 4,505,000	$ 8,766,000
2014 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Bonus expense																	$ 2,105,000	1,512,000	$ 4,505,000	8,766,000
2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of recognition for unrecognized compensation costs			3 years				3 years
2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock \| Time-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments in which awards are vested \| installment															3
Number of anniversaries in which awards are vested \| anniversary															3
2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock \| Performance-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments in which awards are vested \| Vesting_Installment															3
Minimum performance target percentage															8.00%
Performance period															3 years
2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock \| Time Based Vesting on Three Year Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments in which awards are vested \| installment			3										3
Number of anniversaries in which awards are vested \| anniversary											3
2014 Omnibus Incentive Plan \| Management Grantees \| Stock Options \| Time-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate grant date fair value of stock options granted															$ 1,000,000
Fair value valuation assumptions: risk-free rate															1.50%
Fair value valuation assumptions: dividend yield															9.80%
Fair value valuation assumptions: Expected term															6 years
Fair value valuation assumptions: volatility rate															48.00%
2014 Omnibus Incentive Plan \| Board of Directors \| Restricted Stock \| Time-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate grant date fair value of stock options granted															$ 100,000
2014 Omnibus Incentive Plan \| Michael Mazzei \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of recognition for unrecognized compensation costs				3 years
2014 Omnibus Incentive Plan \| Harris \| Restricted Stock \| Time-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
2014 Omnibus Incentive Plan \| Non-Management Grantee \| Restricted Stock \| Time Based Vesting on Three Year Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments in which awards are vested \| installment			3
2014 Deferred Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Days following the end of the participant’s employment																60 days
Stock price, days following the end of the participant’s employment																45 days
Units withdrawn (in shares) \| shares																	13,722		13,722		42,270
Units outstanding (in shares) \| shares																	362,967		362,967		321,476
Units unvested (in shares) \| shares																	238,807		238,807		182,983
Total employee's contribution, net of forfeitures and payouts related to terminations																	$ 5,900,000		$ 5,900,000
Phantom Units1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total employee's contribution, net of forfeitures and payouts related to terminations																					$ 1,000,000
Phantom Units 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total employee's contribution, net of forfeitures and payouts related to terminations																					$ 3,800,000
2018 Bonus Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Bonus expense																	$ 7,800,000	$ 9,300,000	$ 17,600,000	$ 12,400,000
Class A Common Stock \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted (in shares) \| shares	3,566	25,370															3,566	26,653	28,936	859,061
Number of installments in which awards are vested \| installment	3
Vesting period		1 year
Number of anniversaries in which awards are vested \| anniversary	3
Grant date fair value	$ 100,000	$ 400,000
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Executive Officers \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted															$ 9,100,000
Number of restricted shares granted (in shares) \| shares															793,598
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted			$ 10,500,000						$ 10,200,000					$ 30,455
Number of restricted shares granted (in shares) \| shares			768,205							736,461				2,191
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock \| Time-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%					50.00%							50.00%
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock \| Performance-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%					50.00%							50.00%
Number of installments in which awards are vested			3									3	3
Number of anniversaries in which awards are vested \| anniversary											3
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock \| Period 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							3 years
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Management Grantees \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted (in shares) \| shares															289,326
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock With Dividend Equivalent Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted									48,475
Number of restricted shares granted (in shares) \| shares										3,500
Cash dividends received									1,000,000
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Board of Directors \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted									200,000
Number of restricted shares granted (in shares) \| shares										16,245					12,636
Vesting period							1 year
Class A Common Stock \| 2014 Omnibus Incentive Plan \| New Employee \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted									400,000
Number of restricted shares granted (in shares) \| shares										28,881
Number of installments in which awards are vested \| Vesting_Installment												2
Number of anniversaries in which awards are vested \| installment													2
Class A Common Stock \| 2014 Omnibus Incentive Plan \| New Member of Board of Directors \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted						$ 100,000
Number of restricted shares granted (in shares) \| shares						5,130
Number of installments in which awards are vested \| installment						3
Vesting period						3 years
Number of anniversaries in which awards are vested \| anniversary						3
Class A Common Stock \| 2014 Omnibus Incentive Plan \| New Member of Board of Directors \| Restricted Stock \| Year 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares) \| shares					1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| New Member of Board of Directors \| Restricted Stock \| Period 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares) \| shares					1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| New Member of Board of Directors \| Restricted Stock \| Period 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares) \| shares					1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| New Member of Board of Directors \| Restricted Stock \| Period 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares) \| shares					1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| New Member of Board of Directors \| Restricted Stock \| Period 5
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares) \| shares					1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| New Member of Board of Directors \| Restricted Stock \| Period 6
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares) \| shares					1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Michael Mazzei \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted				$ 100,000
Number of restricted shares granted (in shares) \| shares				5,346
Number of installments in which awards are vested \| installment				3
Number of anniversaries in which awards are vested \| anniversary				3
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Non-Management Grantee \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted			$ 5,000,000		$ 300,000				$ 600,000
Number of restricted shares granted (in shares) \| shares			369,328		21,307					40,000
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Non-Management Grantee \| Restricted Stock \| Time-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Non-Management Grantee \| Restricted Stock \| Performance-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%
Number of installments in which awards are vested \| installment			3
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Non-Management Grantee \| Restricted Stock \| Period 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares) \| shares					1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Non-Management Grantee \| Restricted Stock \| Period 7
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares) \| shares					1,780
Class A Common Stock \| 2014 Deferred Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Days following the end of the participant’s employment																3 years