Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 7,113	$ 13,308
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,843	1,362
Purchase accounting adjustments to goodwill	349
Loss on inventory nonmonetary exchanges	90
Gain on disposal of property and equipment, net	(17)	0
Loss on disposal of intangible assets	14	165
Bond premium amortization	712	826
Stock-based compensation	4,526	3,223
Deferred income taxes	(1,445)	(511)
Unrecognized tax benefits	193	(319)
Tax benefit from stock-based compensation	(88)	(6,245)
Change in assets and liabilities:
Accounts and notes receivable	(3,211)	5,569
Inventory	(6,748)	(5,329)
Prepaid expenses and other assets	(14,657)	(8,174)
Accounts payable, accrued and other liabilities	5,078	3,627
Deferred revenue	15,812	3,133
Customer deposits	772	334
Net cash provided by operating activities	10,336	10,969
Cash flows from investing activities:
Purchases of investments	(28,667)	(38,750)
Proceeds from call / maturity of investments	32,429	21,365
Purchases of property and equipment	(1,964)	(1,770)
Proceeds from disposal of property and equipment	33	0
Purchases of intangible assets	(185)	(201)
Business acquisitions, net of cash acquired	0	(7,840)
Net cash provided by (used in) investing activities	1,646	(27,196)
Cash flows from financing activities:
Repurchase of common stock	(33,746)	0
Proceeds from options exercised	222	2,553
Payroll tax payments for net-settled stock awards	(1,036)	(647)
Payments on capital lease obligation	(19)	(18)
Payments on notes payable	(29)	0
Tax benefit from stock-based compensation	88	6,245
Net cash (used in) provided by financing activities	(34,520)	8,133
Effect of exchange rate changes on cash and cash equivalents	318	81
Net decrease in cash and cash equivalents	(22,220)	(8,013)
Cash and cash equivalents, beginning of period	59,526	48,367
Cash and cash equivalents, end of period	37,306	40,354
Supplemental disclosure:
Cash paid for income taxes, net of refunds	8,271	4,848
Non-cash transactions
Property and equipment purchases in accounts payable and accrued liabilities	$ 90	$ 205