Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
OPERATING ACTIVITIES
Net income	$ 16,107	$ 10,747	$ 6,480
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	2,251	1,754	830
Amortization	7,827	6,341	3,954
Deferred income taxes	(613)	531	205
Non-cash stock compensation and retirement savings plan contributions	9,590	9,178	10,831
Tax benefit from stock option exercises and restricted stock vesting	(1,061)	(1,838)	(1,531)
Adjustment to fair value of contingent consideration	517	1,586	(4)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(818)	(7,587)	(5,491)
Other assets	1,074	(320)	1,626
Accounts payable	2,190	(1,522)	642
Other liabilities	2,147	(4,550)	1,189
Net cash provided by operating activities	39,211	14,320	18,731
INVESTING ACTIVITIES
Proceeds from maturity of investments		13,555
Purchase of investments			4,252
Purchase of property and equipment	(1,923)	(2,776)	(1,161)
Capitalization of software developed for internal use	(187)	(179)	(160)
Purchase of business	(36,560)	(19,385)	(4,941)
Net cash used in investing activities	(38,670)	(8,785)	(10,514)
FINANCING ACTIVITIES
Payment of credit facility financing fees		(306)
Proceeds from line of credit	134,900	14,000
Payments on line of credit	(132,100)	(14,000)
Payment of contingent consideration for purchase of business	(556)	(1,244)	(1,875)
Tax benefit on stock option exercises and restricted stock vesting	1,061	1,838	1,531
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan	202	3,712	1,468
Purchase of treasury stock	(6,118)	(11,791)	(14,676)
Remittance of taxes withheld as part of a net share settlement of restricted stock vesting	(1,857)	(747)
Net cash used in financing activities	(4,468)	(8,538)	(13,552)
Effect of exchange rate on cash and cash equivalents	8	28	67
Change in cash and cash equivalents	(3,919)	(2,975)	(5,268)
Cash and cash equivalents at beginning of period	9,732	12,707	17,975
Cash and cash equivalents at end of period	5,813	9,732	12,707
Supplemental disclosures:
Cash paid for interest	168	5	22
Cash paid for income taxes	9,687	7,810	4,265
Non-cash activity:
Stock issued for purchase of business (net of stock reaquired for escrow claim)	14,411	6,616	2,859
Stock issued for settlement of contingent consideration for purchase of business	2,199	2,915	768
Estimated fair value of contingent consideration for purchase of business		$ 2,377	$ 3,339