STOCKHOLDERS' EQUITY (Details)							3 Months Ended		9 Months Ended
	Aug. 07, 2015 USD ($) $ / shares shares	Jul. 28, 2015 USD ($) $ / shares	Apr. 27, 2015 USD ($) $ / shares	Mar. 06, 2015 USD ($) $ / shares shares	Feb. 03, 2015 USD ($) $ / shares	Jan. 05, 2015 item $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Dividends
Dividends declared | $		$ 19,622,000	$ 19,635,000		$ 19,637,000
Dividends Payable, Amount Per Share | $ / shares		$ 0.20	$ 0.20		$ 0.20
Dividends and dividend equivalents | $									$ 59,012,000	$ 39,003,000
Accrued unpaid dividends | $							$ 107,000		107,000
Increase to additional paid-in capital related to stock based compensation | $									9,377,000
Equity disclosures
Stock-based compensation expense included in general and administrative expenses | $							2,199,000		$ 9,377,000	$ 6,072,000
Stock-based compensation credit included in general and administrative expenses | $								$ 1,596,000
Expected performance target to be achieved (as a percent)									120.00%
Expected performance payout (as a percent)									150.00%
Total estimated unrecognized compensation cost related to nonvested stock-based compensation arrangements | $							$ 2,144,000		$ 2,144,000
Restricted stock unit | Performance Vesting
Dividends
Vested units withheld for taxes									3,131
Equity disclosures
Restricted stock unit granted (in shares)									377,730
Shares of RSU and PSU
Granted (in shares)									377,730
Vested (in shares)									(84,649)
Forfeited (in shares)									(47,255)
Nonvested at the end of the period (in shares)							245,826		245,826
Weighted Average Grant Date Fair Value
Granted (in dollars per share) | $ / shares									$ 33.74
Vested (in dollars per share) | $ / shares									33.96
Forfeited (in dollars per share) | $ / shares									33.96
Unvested at the end of the period (in dollars per share) | $ / shares							$ 33.62		$ 33.62
Members of management | Restricted stock unit | Performance Vesting
Equity disclosures
Expected performance target to be achieved (as a percent)									120.00%
2013 Equity Incentive Plan | Stock options
Equity disclosures
Number of shares authorized							9,474,000		9,474,000
Number of shares remaining available for grant							8,266,166		8,266,166
Price per share (in dollars per share) | $ / shares	$ 29.59			$ 33.96		$ 24.97
2013 Equity Incentive Plan | Members of managment and executive officers | Restricted stock unit | Performance Vesting
Equity disclosures
Stock-based compensation expense included in general and administrative expenses | $							$ 2,064,000		$ 3,990,000
Number of days form the termination of service for settlement of fully vested RSU				60 days
Percentage of performance target				100.00%
Number of PSUs vesting, if Holdings does not achieve free cash flow minimum performance target				0
Estimated grant date fair value | $				$ 4,870,000
2013 Equity Incentive Plan | Members of managment and executive officers | Restricted stock unit | Performance Vesting | Minimum
Equity disclosures
PSUs vesting as a percentage of performance target				80.00%
Percentage of performance target				100.00%
Awards to be granted on achieving specified percentage of performance target (in shares)				143,398
2013 Equity Incentive Plan | Members of managment and executive officers | Restricted stock unit | Performance Vesting | Maximum
Equity disclosures
PSUs vesting as a percentage of performance target				120.00%
Percentage of performance target				120.00%
Awards to be granted on achieving specified percentage of performance target (in shares)				215,106
2013 Equity Incentive Plan | Members of managment and executive officers | Restricted stock unit | Performance Vesting | 30% | Minimum
Equity disclosures
Percentage of performance target				30.00%
2013 Equity Incentive Plan | Members of managment and executive officers | Restricted stock unit | Performance Vesting | 150% | Minimum
Equity disclosures
Percentage of performance target				150.00%
2013 Equity Incentive Plan | Members of management | Restricted stock unit
Equity disclosures
Stock-based compensation expense included in general and administrative expenses | $									2,875,000
Restricted stock unit granted (in shares)				84,649
Number of shares that will be received under each RSU				1
Shares of RSU and PSU
Granted (in shares)				84,649
2013 Equity Incentive Plan | Members of management | Restricted stock unit | Performance Vesting
Equity disclosures
Number of days form the termination of service for settlement of fully vested RSU				60 days
2013 Equity Incentive Plan | Executive officers | Restricted stock unit
Equity disclosures
Stock-based compensation expense included in general and administrative expenses | $									1,995,000
Restricted stock unit granted (in shares)				58,749
Grant date fair value (in dollars) | $				$ 1,995,000
Shares of RSU and PSU
Granted (in shares)				58,749
2013 Equity Incentive Plan | Executive officers | Restricted stock
Equity disclosures
Number of days form the termination of service for settlement of fully vested RSU				60 days
2013 Equity Incentive Plan | Chief Executive officer and President | Restricted stock unit
Equity disclosures
Stock-based compensation expense included in general and administrative expenses | $									135,000
Restricted stock unit granted (in shares)	19,226
Number of shares that will be received under each RSU	1
Grant date fair value (in dollars) | $	$ 569,000
Shares of RSU and PSU
Granted (in shares)	19,226
Class A common stock
Dividends
Dividends and dividend equivalents | $									12,945,000
Class A common stock | 2013 Equity Incentive Plan | Board of Director
Equity disclosures
Stock-based compensation expense included in general and administrative expenses | $									382,000
Shares granted						3,828
Total shares granted						15,312
Number of Board of Directors to whom common stock was granted | item						4
Class B common stock
Dividends
Dividends and dividend equivalents | $									45,496,000
Dividend equivalents
Dividends
Dividends and dividend equivalents | $									571,000
Wanda
Dividends
Receivable due from related party | $							$ 637,000		$ 637,000		$ 156,000