FAIR VALUE MEASUREMENTS: (Details) (USD $)	3 Months Ended
	Mar. 31, 2014 VIE	Dec. 31, 2013
8.375% Senior Notes due 2018
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	8.375%
6.375% Senior Unsecured Notes, due 2021
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	6.375%
6.125% Senior Unsecured Notes due 2022
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	6.125%
5.375% Senior Unsecured Notes due 2021
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	5.375%
Level 1 | Fair Value | Cunningham
FAIR VALUE MEASUREMENTS:
Number of VIEs who classify investments as trading securities	1
Fair value of trading securities	$ 18,600,000	$ 18,100,000
Level 2 | Carrying Value | 8.375% Senior Notes due 2018
FAIR VALUE MEASUREMENTS:
Fair Value	235,322,000	235,225,000
Level 2 | Carrying Value | 6.375% Senior Unsecured Notes, due 2021
FAIR VALUE MEASUREMENTS:
Fair Value	350,000,000	350,000,000
Level 2 | Carrying Value | 6.125% Senior Unsecured Notes due 2022
FAIR VALUE MEASUREMENTS:
Fair Value	500,000,000	500,000,000
Level 2 | Carrying Value | 5.375% Senior Unsecured Notes due 2021
FAIR VALUE MEASUREMENTS:
Fair Value	600,000,000	600,000,000
Level 2 | Carrying Value | Term Loan A
FAIR VALUE MEASUREMENTS:
Fair Value	500,000,000	500,000,000
Level 2 | Carrying Value | Term Loan B
FAIR VALUE MEASUREMENTS:
Fair Value	641,244,000	642,734,000
Level 2 | Carrying Value | Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Fair Value	54,123,000	55,581,000
Level 2 | Carrying Value | Debt of other operating divisions
FAIR VALUE MEASUREMENTS:
Fair Value	91,983,000	86,263,000
Level 2 | Fair Value | 8.375% Senior Notes due 2018
FAIR VALUE MEASUREMENTS:
Fair Value	254,836,000	259,547,000
Level 2 | Fair Value | 6.375% Senior Unsecured Notes, due 2021
FAIR VALUE MEASUREMENTS:
Fair Value	365,096,000	360,938,000
Level 2 | Fair Value | 6.125% Senior Unsecured Notes due 2022
FAIR VALUE MEASUREMENTS:
Fair Value	508,125,000	497,525,000
Level 2 | Fair Value | 5.375% Senior Unsecured Notes due 2021
FAIR VALUE MEASUREMENTS:
Fair Value	597,000,000	582,078,000
Level 2 | Fair Value | Term Loan A
FAIR VALUE MEASUREMENTS:
Fair Value	495,000,000	495,000,000
Level 2 | Fair Value | Term Loan B
FAIR VALUE MEASUREMENTS:
Fair Value	634,273,000	641,205,000
Level 2 | Fair Value | Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Fair Value	54,123,000	55,581,000
Level 2 | Fair Value | Debt of other operating divisions
FAIR VALUE MEASUREMENTS:
Fair Value	$ 91,983,000	$ 86,263,000