Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 14,829	$ 14,832
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,310	3,368
(Gain) loss on write-down / disposal of property and equipment, net	(13)	17
Loss on disposal of intangibles	216	211
Bond premium amortization	1,252	675
Stock-based compensation	5,086	4,121
Deferred income taxes	(888)	9,862
Unrecognized tax benefits	(273)	(1,713)
Excess tax benefit from stock-based compensation	(6,314)	(5,849)
Change in assets and liabilities:
Accounts and notes receivable	7,718	(4,611)
Inventory	(37)	(5,019)
Prepaid expenses and other assets	(5,520)	(1,063)
Accounts payable, accrued and other liabilities	1,697	(1,188)
Deferred revenue	10,667	9,780
Customer deposits	(416)	(785)
Net cash provided by operating activities	30,314	22,638
Cash flows from investing activities:
Purchases of investments	(50,598)	(23,613)
Proceeds from call / maturity of investments	32,719	8,668
Purchases of property and equipment	(3,839)	(2,066)
Proceeds from disposal of fixed assets	13	10
Purchases of intangible assets	(402)	(125)
Business acquisitions, net of cash acquired	(11,186)
Net cash used in investing activities	(33,293)	(17,126)
Cash flows from financing activities:
Repurchase of common stock	(7,556)	(22,442)
Proceeds from options exercised	2,573	8,597
Payroll tax payments for net-settled stock awards	(848)	(1,262)
Payments on capital lease obligation	(28)	(26)
Payments on notes payable	(26)	0
Excess tax benefit from stock-based compensation	6,314	5,849
Net cash provided by (used in) financing activities	429	(9,284)
Effect of exchange rate changes on cash and cash equivalents	70	116
Net decrease in cash and cash equivalents	(2,480)	(3,656)
Cash and cash equivalents, beginning of period	48,367	42,271
Cash and cash equivalents, end of period	45,887	38,615
Supplemental disclosure:
Cash paid for income taxes, net of refunds	5,830	403
Non-cash transactions
Property and equipment purchases in accounts payable and accrued liabilities	$ 195	$ 158