CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income (loss)	$ 33,880	$ (4,253)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	12,890	8,014
Provision (recovery) for doubtful accounts	367	(205)
Stock-based compensation expense	4,388	5,344
Non-cash interest expense	5,394	207
Unrealized foreign currency transaction losses (gains)	1,578	(4,043)
Benefit for deferred taxes	(1,365)	(6,514)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	13,683	8,935
Inventories	(5,829)	8,940
Prepaid expenses and other current assets	(3,994)	784
Accounts payable	(10,373)	347
Accrued expenses, compensation and benefits and other liabilities	(13,910)	(17,362)
Income taxes payable	(510)	770
Deferred revenues	(81,215)	(27,178)
Net cash used in operating activities	(45,016)	(26,214)
Cash flows from investing activities:
Purchases of property and equipment	(7,321)	(6,742)
Payments for business and technology acquisitions, net of cash acquired	0	(65,967)
Increase in other long-term assets	(12)	(850)
Increase in restricted cash	(4,544)	(2,330)
Net cash used in investing activities	(11,877)	(75,889)
Cash flows from financing activities:
Proceeds from long-term debt	100,000	121,150
Repayment of debt	(1,250)	0
Cash paid for capped call transactions	0	(10,125)
Proceeds from the issuance of common stock under employee stock plans	285	2,804
Common stock repurchases for tax withholdings for net settlement of equity awards	(441)	(1,299)
Proceeds from revolving credit facilities	25,000	29,500
Payments on revolving credit facilities	(30,000)	(29,500)
Payments for credit facility issuance costs	(4,971)	(505)
Net cash provided by financing activities	88,623	112,025
Effect of exchange rate changes on cash and cash equivalents	733	(331)
Net increase in cash and cash equivalents	32,463	9,591
Cash and cash equivalents at beginning of period	17,902	25,056
Cash and cash equivalents at end of period	50,365	34,647
Supplemental Cash Flow Information [Abstract]
Cash paid for income taxes, net of refunds	1,003	877
Cash paid for interest	3,690	981
Long-term Debt [Member]
Non-cash Financing Activities:
Issuance costs for debt	49	581
Line of Credit [Member]
Non-cash Financing Activities:
Issuance costs for debt	$ 0	$ 634