INCOME TAXES (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal	$ 26,516,000	$ (2,260,000)	$ 22,779,000
State	3,996,000	1,974,000	2,226,000
Foreign	31,000	55,000	12,000
Total current	30,543,000	(231,000)	25,017,000
Deferred:
Federal	(10,919,000)	15,512,000	(14,661,000)
State	(1,849,000)	(2,067,000)	(2,425,000)
Foreign	28,000	5,000	(18,000)
Total deferred	(12,740,000)	13,450,000	(17,104,000)
Total provision for income taxes	17,803,000	13,219,000	7,913,000
Deferred tax assets:
Reserve for bad debts	1,274,000	1,106,000
Accrued compensation	6,725,000	4,830,000
Stock compensation	13,381,000	4,946,000
Net operating losses	17,457,000	20,431,000
Accrued reserve and other	4,284,000	6,007,000
Unrealized loss on securities	786,000	928,000
Deferred rent	4,329,000	1,845,000
Deferred revenue	1,538,000	1,220,000
Deferred gain from sale of building	11,499,000	12,386,000
Total deferred tax assets	61,273,000	53,699,000
Deferred tax liabilities:
Prepaids	(1,096,000)	(1,433,000)
Depreciation	(6,033,000)	(3,676,000)
Intangibles	(55,284,000)	(62,915,000)
Total deferred tax liabilities	(62,413,000)	(68,024,000)
Net deferred tax liabilities, prior to valuation allowance	(1,140,000)	(14,325,000)
Valuation allowance	(10,936,000)	(10,490,000)
Net deferred tax liabilities	(12,076,000)	(24,815,000)
Income from U.S. sources	53,200,000	36,100,000	29,100,000
Loss from foreign sources	(5,600,000)	(13,000,000)	(6,600,000)
Effective tax rate reconciliation [Abstract]
Expected federal income tax provision at statutory rate	16,638,000	8,097,000	7,899,000
State income taxes, net of federal benefit	885,000	(1,360,000)	(123,000)
Foreign income taxes, net effect	(724,000)	(2,971,000)	(961,000)
Stock compensation	(116,000)	(313,000)	(143,000)
Increase in valuation allowance	588,000	2,978,000	643,000
Nondeductible compensation	431,000	656,000	448,000
Nondeductible transaction costs	0	5,829,000	0
Other adjustments	101,000	303,000	150,000
Total provision for income taxes	17,803,000	13,219,000	7,913,000
Income taxes paid	6,500,000	2,600,000	19,500,000
Operating Loss Carryforwards [Line Items]
Change in valuation allowance	(446,000)	(5,220,000)
Cash tax benefits resulting in net operating loss carryforward	4,200,000	12,200,000
Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefit beginning balance	3,909,000	3,347,000	1,766,000
Increase for current year tax positions	66,000	792,000	1,243,000
Decrease for prior period tax positions		(161,000)
Increase for prior year tax positions	2,037,000		445,000
Expiration of the statute of limitation for assessment of taxes	(55,000)	(69,000)	(107,000)
Unrecognized tax benefit ending balance	5,957,000	3,909,000	3,347,000
Unrecognized tax benefit that would favorably affect the annual effective tax rate if recognized in future periods	1,600,000	1,600,000
Interest and penalties on income taxes recognized	62,000	58,000	39,000
Interest and penalties accrued on income taxes	404,000	342,000	284,000
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Change in valuation allowance	(765,000)
Net operating loss carryforward	31,200,000
Domestic Country [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	13,500,000
Operating loss carryforwards, first expiration date	Dec. 31, 2020
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Change in valuation allowance	(319,000)
Net operating loss carryforward	4,900,000
Operating loss carryforwards, first expiration date	Dec. 31, 2020
Income tax credit carryforward	$ 1,800,000