INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income before income taxes
United States	$ 32,148	$ 18,406	$ 23,880
Foreign	3,258	2,501	2,690
INCOME BEFORE INCOME TAXES	35,406	20,907	26,570
Currently payable income taxes
Federal	9,447	3,062	6,247
State	1,221	2,408	5,366
Foreign	838	927	1,115
Total	11,506	6,397	12,728
Deferred income taxes
Federal	946	2,333	1,325
State	619	323	(1,368)
Foreign	(92)	(226)	(44)
Total	1,473	2,430	(87)
Provision for income taxes	12,979	8,827	12,641
Reconciliation of the provision for income taxes at the statutory rate to the provision for income taxes at effective rate
Statutory rate for income taxes (as a percent)	35.00%
Computed at the statutory rate	12,392	7,318	9,300
State income taxes, net of federal tax effect	1,136	1,747	2,599
Non-deductible compensation	19	20	587
Permanent differences	578	450	178
Foreign tax and change in foreign valuation allowance	(394)	(175)	129
Research and development credits	(239)	(490)	(437)
Other	(513)	(43)	285
Provision for income taxes	12,979	8,827	12,641
Deferred tax assets:
Allowance for doubtful accounts	1,524	1,686
Share-based compensation	9,711	9,655
Intangible assets	2,483	959
Deferred rent	799	1,075
Accrued liabilities	2,574	3,324
Foreign loss carryforwards	69	140
State net operating loss carryforwards	631	798
Valuation allowances	(101)	(172)
Total deferred tax assets	17,690	17,465
Deferred tax liabilities:
Prepaid expenses	(2,740)	(1,548)
Intangible assets	(35,523)	(31,971)
Property and equipment and software development costs	(13,817)	(16,730)
Deferred debt discharge income	(3,300)	(3,285)
Other	(318)	(466)
Total deferred tax liabilities	(55,698)	(54,000)
Net deferred tax liability	$ (38,008)	$ (36,535)