SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 item	Sep. 30, 2012	Dec. 31, 2012
SEGMENT INFORMATION
Number of operating segments which are also reportable segments			2
SEGMENT INFORMATION
Revenue	$ 119,156	$ 117,195	$ 379,020	$ 362,602
Cost of sales	41,991	41,741	131,788	127,793
Gross profit	77,165	75,454	247,232	234,809
Selling and marketing expense	12,951	13,282	40,958	41,323
General and administrative expense	27,387	26,626	81,917	79,032
Amortization expense of intangibles	1,950	6,669	5,858	21,001
Depreciation expense	3,499	3,311	10,859	9,839
Direct segment operating expenses	45,787	49,888	139,592	151,195
Operating income	31,378	25,566	107,640	83,614
Total assets
Total assets	881,615		881,615		906,920
Membership and Exchange
SEGMENT INFORMATION
Revenue	86,615	86,092	284,227	276,725
Cost of sales	20,442	20,538	68,679	68,384
Gross profit	66,173	65,554	215,548	208,341
Selling and marketing expense	11,919	12,345	37,973	38,472
General and administrative expense	21,519	21,819	64,211	65,960
Amortization expense of intangibles	337	4,968	1,011	15,808
Depreciation expense	3,186	3,011	9,872	9,025
Operating income	29,212	23,411	102,481	79,076
Total assets
Total assets	766,890		766,890		789,451
Management and Rental
SEGMENT INFORMATION
Management fee revenue	16,209	15,117	47,825	41,165
Pass-through revenue	16,332	15,986	46,968	44,712
Revenue	32,541	31,103	94,793	85,877
Cost of sales	21,549	21,203	63,109	59,409
Gross profit	10,992	9,900	31,684	26,468
Selling and marketing expense	1,032	937	2,985	2,851
General and administrative expense	5,868	4,807	17,706	13,072
Amortization expense of intangibles	1,613	1,701	4,847	5,193
Depreciation expense	313	300	987	814
Operating income	2,166	2,155	5,159	4,538
Total assets
Total assets	$ 114,725		$ 114,725		$ 117,469