CORPORATE BORROWINGS (Details) (USD $)	0 Months Ended	6 Months Ended
	Apr. 30, 2013	Jun. 30, 2013 item
Senior Secured Credit Facility
CORPORATE BORROWINGS
Maximum borrowing capacity	$ 925,000,000
3rd party costs in connection with repurchase of debt		240,000
Fee on undrawn amount of the letter of credit (as a percent)	0.25%
Maximum senior secured leverage ratio		3.25
Principal amount of guarantor or any significant subsidiary considered for defaults under other indebtedness, minimum		25,000,000
Number of uninsured judgments against the entity, any guarantor, or any significant subsidiary for specified principal amount considered as events of default, minimum		1
Principal amount for which uninsured judgments against the entity, any guarantor, or any significant subsidiary considered as events of default		25,000,000
Stay of enforcement period		60 days
Senior Secured Credit Facility | LIBOR
CORPORATE BORROWINGS
Variable rate basis	LIBOR
Reference rate (as a percent)	0.75%
Senior Secured Credit Facility | Base rate
CORPORATE BORROWINGS
Variable rate basis	Base rate
Reference rate (as a percent)	1.75%
Revolving credit facility due in 2018
CORPORATE BORROWINGS
Maximum borrowing capacity	150,000,000
Capitalized deferred financing costs	6,654,000
Borrowings outstanding under the Revolving Credit Facility		0
Unused commitment fee (as a percent)	0.50%
Revolving credit facility due in 2018 | LIBOR | Minimum
CORPORATE BORROWINGS
Spread over interest rate (as a percent)	2.25%
Revolving credit facility due in 2018 | LIBOR | Maximum
CORPORATE BORROWINGS
Spread over interest rate (as a percent)	2.50%
Revolving credit facility due in 2018 | Base rate | Minimum
CORPORATE BORROWINGS
Spread over interest rate (as a percent)	1.25%
Revolving credit facility due in 2018 | Base rate | Maximum
CORPORATE BORROWINGS
Spread over interest rate (as a percent)	1.50%
Credit Facility term loans due in 2020
CORPORATE BORROWINGS
Maximum borrowing capacity	775,000,000
Required quarterly repayments of principal (as a percent)	0.25%
Principal repayments per quarter	1,937,500
Capitalized deferred financing costs	1,282,000
Redemption amount on April 30, 2013		773,062,000
Discount percentage on issuance of term loan	0.25%
Interest rate for borrowings (as a percent)		3.50%
Variable rate basis	LIBOR
Spread over interest rate (as a percent)		2.75%
Annual repayments of debt	7,750,000
Credit Facility term loans due in 2020 | LIBOR
CORPORATE BORROWINGS
Spread over interest rate (as a percent)	2.75%
Credit Facility term loans due in 2020 | LIBOR | Minimum
CORPORATE BORROWINGS
Reference rate (as a percent)		0.75%
Credit Facility term loans due in 2020 | Base rate
CORPORATE BORROWINGS
Spread over interest rate (as a percent)	1.75%
Credit Facility term loans due 2016
CORPORATE BORROWINGS
Redemption price of debt instrument (as a percent)	100.00%
Redemption amount on April 30, 2013	464,088,000
Interest rate for borrowings (as a percent)	4.25%
Variable rate basis	LIBOR
Spread over interest rate (as a percent)	3.25%
Credit Facility term loans due 2016 | LIBOR | Minimum
CORPORATE BORROWINGS
Reference rate (as a percent)	1.00%
Credit Facility term loans due 2018
CORPORATE BORROWINGS
Redemption price of debt instrument (as a percent)	100.00%
Redemption amount on April 30, 2013	$ 296,250,000
Interest rate for borrowings (as a percent)	4.75%
Spread over interest rate (as a percent)	3.75%
Credit Facility term loans due 2018 | LIBOR | Minimum
CORPORATE BORROWINGS
Reference rate (as a percent)	1.00%
8.75% Senior Fixed Rate Notes due 2019
CORPORATE BORROWINGS
Stated interest rate (as a percent)		8.75%