Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 3,463	$ 7,205
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	901	617
Purchase accounting adjustments to goodwill	372
Gain on disposal of property and equipment, net	(23)	0
Loss on disposal of intangible assets	0	139
Bond premium amortization	375	379
Stock-based compensation	2,220	1,544
Deferred income taxes	(721)	(471)
Unrecognized tax benefits	96	174
Tax shortfall (benefit) from stock-based compensation	21	(1,679)
Change in assets and liabilities:
Accounts and notes receivable	(2,195)	9,713
Inventory	(4,327)	(4,303)
Prepaid expenses and other assets	(4,070)	(1,399)
Accounts payable, accrued and other liabilities	5,560	47
Deferred revenue	4,380	1,383
Customer deposits	1,041	(341)
Net cash provided by operating activities	7,093	13,008
Cash flows from investing activities:
Purchases of investments	(20,328)	(26,863)
Proceeds from call / maturity of investments	18,033	10,629
Purchases of property and equipment	(1,280)	(424)
Proceeds from disposal of property and equipment	36	0
Purchases of intangible assets	(98)	(50)
Net cash used in investing activities	(3,637)	(16,708)
Cash flows from financing activities:
Repurchase of common stock	(8,962)	0
Proceeds from options exercised	30	605
Payroll tax payments for net-settled stock awards	(744)	(194)
Payments on capital lease obligation	(10)	(9)
Payments on notes payable	(15)	0
Tax (shortfall) benefit from stock-based compensation	(21)	1,679
Net cash (used in) provided by financing activities	(9,722)	2,081
Effect of exchange rate changes on cash and cash equivalents	105	100
Net decrease in cash and cash equivalents	(6,161)	(1,519)
Cash and cash equivalents, beginning of period	59,526	48,367
Cash and cash equivalents, end of period	53,365	46,848
Supplemental disclosure:
Cash paid for income taxes, net of refunds	3,533	209
Non-cash transactions
Property and equipment purchases in accounts payable and accrued liabilities	$ 54	$ 42