Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Document Period End Date	Mar. 31, 2017
Cash flows from operating activities:
Net Income (Loss) Attributable to Parent	$ 26,427	$ 22,159
Net Income (Loss) Attributable to Noncontrolling Interest	196	192
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,855	2,720
Benefit for deferred taxes	(850)	(165)
Share based compensation	686	647
Provision for doubtful accounts	407	(241)
Unrealized foreign exchange gain	(860)	(48)
Capitalized Computer Software, Amortization	410	326
Reduction of acquisition earnout accruals	0	(511)
Reduction of rent expense as a result of purchase accounting adjustment	(948)	0
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable	(5,661)	(8,669)
Other assets	112	(220)
Accounts payable and accrued expenses	(7,118)	(7,563)
Accrued payroll and related benefits	(1,021)	717
Deferred revenue	382	1,258
Deferred rent	(102)	(80)
Unrecognized tax benefits, period increase (decrease)	518	50
Other current liabilities	268	(38)
Net cash provided by operating activities	15,701	10,534
Cash flows from investing activities:
Payments to Develop Software	(514)	(144)
Purchases of marketable securities	(1,005)	(596)
Capital expenditures	(2,705)	(1,028)
Net cash used in investing activities	(4,224)	(1,768)
Cash flows from financing activities:
Proceeds from (Repayments of) Lines of Credit	40,000	20,000
Debt Instrument, Periodic Payment, Principal	(3,125)	0
Repurchases of common stock	(40,517)	(14,787)
Proceeds from the exercise of stock options	52	29
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested	(167)	(66)
Dividend payments	(2,428)	(2,422)
Repayments of Long-term Capital Lease Obligations	(1)	0
Net cash provided by (used in) financing activities	(6,186)	2,754
Effect of foreign exchange rates on cash	786	321
Net change in cash and cash equivalents	6,077	11,841
Cash and cash equivalents at the beginning of the period	114,118	57,179
Cash and cash equivalents at the end of the period	120,195	69,020
Supplemental disclosures of cash flow information:
Interest paid	2,289	1,987
Income taxes paid	$ 6,663	$ 7,015