Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 10,956	$ 14,829
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,744	2,310
Purchase accounting adjustments to goodwill	520
Loss on inventory nonmonetary exchanges	147
Loss (gain) on disposal of property and equipment, net	40	(13)
Loss on disposal of intangible assets	21	216
Bond premium amortization	980	1,252
Stock-based compensation	6,742	5,086
Deferred income taxes	(2,672)	(888)
Unrecognized tax benefits	17	(273)
Tax benefit from stock-based compensation	(919)	(6,314)
Change in assets and liabilities:
Accounts and notes receivable	(5,277)	7,718
Inventory	(10,804)	(37)
Prepaid expenses and other assets	(19,573)	(5,520)
Accounts payable, accrued and other liabilities	12,566	1,697
Deferred revenue	26,331	10,667
Customer deposits	140	(416)
Net cash provided by operating activities	21,959	30,314
Cash flows from investing activities:
Purchases of investments	(49,316)	(50,598)
Proceeds from call / maturity of investments	55,235	32,719
Purchases of property and equipment	(3,335)	(3,839)
Proceeds from disposal of property and equipment	40	13
Purchases of intangible assets	(339)	(402)
Business acquisitions, net of cash acquired	0	(11,186)
Net cash provided by (used in) investing activities	2,285	(33,293)
Cash flows from financing activities:
Repurchase of common stock	(33,746)	(7,556)
Proceeds from options exercised	431	2,573
Payroll tax payments for net-settled stock awards	(1,299)	(848)
Payments on capital lease obligation	(29)	(28)
Payments on notes payable	(77)	(26)
Tax benefit from stock-based compensation	919	6,314
Net cash (used in) provided by financing activities	(33,801)	429
Effect of exchange rate changes on cash and cash equivalents	631	70
Net decrease in cash and cash equivalents	(8,926)	(2,480)
Cash and cash equivalents, beginning of period	59,526	48,367
Cash and cash equivalents, end of period	50,600	45,887
Supplemental disclosure:
Cash paid for income taxes, net of refunds	11,308	5,830
Non-cash transactions
Property and equipment purchases in accounts payable and accrued liabilities	$ 145	$ 195