CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 20,929	$ (169)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	6,347	4,051
Provision (recovery) for doubtful accounts	319	(206)
Stock-based compensation expense	2,098	2,461
Non-cash interest expense	3,878	0
Unrealized foreign currency transaction losses (gains)	2,936	(6,690)
(Benefit) provision for deferred taxes	(784)	5
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	14,800	3,097
Inventories	(3,579)	8,276
Prepaid expenses and other current assets	(4,061)	(2,510)
Accounts payable	(14,216)	(3,440)
Accrued expenses, compensation and benefits and other liabilities	(960)	1,627
Income taxes payable	1,093	267
Deferred revenues	(40,009)	(2,139)
Net cash (used in) provided by operating activities	(11,209)	4,630
Cash flows from investing activities:
Purchases of property and equipment	(4,518)	(2,940)
Decrease (increase) in other long-term assets	(8)	(13)
Increase in restricted cash	(4,544)	0
Net cash used in investing activities	(9,070)	(2,953)
Cash flows from financing activities:
Proceeds from long-term debt	100,000	0
Proceeds from the issuance of common stock under employee stock plans	0	719
Common stock repurchases for tax withholdings for net settlement of equity awards	(307)	(793)
Proceeds from revolving credit facilities	25,000	8,000
Payments on revolving credit facilities	(30,000)	(8,000)
Payments for credit facility issuance costs	(4,919)	(582)
Net cash provided by (used In) financing activities	89,774	(656)
Effect of exchange rate changes on cash and cash equivalents	433	(586)
Net increase in cash and cash equivalents	69,928	435
Cash and cash equivalents at beginning of period	17,902	25,056
Cash and cash equivalents at end of period	87,830	25,491
Supplemental Cash Flow Information [Abstract]
Cash paid for income taxes, net of refunds	600	279
Cash paid for interest	353	372
Non-cash Financing Activities:
Issuance costs for long-term debt	$ 363	$ 0