SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) license shares	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) license	Mar. 20, 2014 USD ($)	Oct. 28, 1999 USD ($)
Variable Interest Entities
Net revenues	$ 502,338	$ 404,151	$ 966,501	$ 778,032
Income from equity and cost method investments	2,007	742	$ 5,153	840
Decrease in accounts payable					$ 41,800
Share Repurchase Program
Share repurchase program, authorized amount						$ 150,000	$ 150,000
Number of shares repurchased | shares			300
Value of shares repurchased			$ 7,803	82,371
Total remaining authorization amount	126,600		$ 126,600
Consolidated VIEs, aggregated
Variable Interest Entities
Initial term of certain outsourcing agreements			5 years
Number of licensees as VIEs | license			37		37
Net revenues	71,800	71,800	$ 136,600	138,200
Consolidated VIEs | Eliminations
Variable Interest Entities
Liabilities associated with the certain outsourcing agreements and purchase options	78,900		78,900		$ 78,100
Consolidated VIEs | Eliminations | Cunningham
Variable Interest Entities
Total payments made under the LMA excluded from liabilities	36,000		36,000		34,400
Total capital leased liabilities excluded from VIE consolidation	4,300		4,300		4,300
VIEs which are not primary beneficiary
Variable Interest Entities
Carrying amount	19,300		19,300		$ 22,700
Income from equity and cost method investments	$ 2,600	$ 700	$ 5,500	$ 900