CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ (1,915)	$ 20,940
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	5,815	6,347
Provision (recovery) for doubtful accounts	(110)	319
Stock-based compensation expense	1,411	2,087
Non-cash interest expense	3,131	3,878
Unrealized foreign currency transaction losses (gains)	1,722	2,936
Benefit for deferred taxes	(374)	(784)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	14	14,800
Inventories	1,573	(3,579)
Prepaid expenses and other current assets	(5,850)	(4,061)
Accounts payable	2,388	(14,216)
Accrued expenses, compensation and benefits and other liabilities	(1,773)	(960)
Income taxes payable	164	1,093
Deferred revenues	(2,662)	(40,009)
Net cash used in operating activities	3,534	(11,209)
Cash flows from investing activities:
Purchases of property and equipment	(1,729)	(4,518)
Increase in other long-term assets	(7)	(8)
Increase in restricted cash	1,700	(4,544)
Net cash used in investing activities	(36)	(9,070)
Cash flows from financing activities:
Proceeds from long-term debt	0	100,000
Repayment of debt	(1,250)	0
Proceeds from the issuance of common stock under employee stock plans	2	0
Common stock repurchases for tax withholdings for net settlement of equity awards	(372)	(307)
Proceeds from revolving credit facilities	0	25,000
Payments on revolving credit facilities	0	(30,000)
Payments for credit facility issuance costs	0	(4,919)
Net cash provided by financing activities	(1,620)	89,774
Effect of exchange rate changes on cash and cash equivalents	188	433
Net increase (decrease) in cash and cash equivalents	2,066	69,928
Cash and cash equivalents at beginning of period	44,948	17,902
Cash and cash equivalents at end of period	47,014	87,830
Supplemental Cash Flow Information [Abstract]
Cash paid for income taxes, net of refunds	19	600
Cash paid for interest	1,665	353
Non-cash Financing Activities:
Issuance costs for long-term debt	$ 0	$ 363