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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (25,763)	$ (25,950)	$ (67,836)	$ (52,613)
Other comprehensive income (loss):
Foreign currency translation adjustments	(835)	838	(748)	1,321
Marketable securities:
Unrealized gain (loss) on marketable securities	167	77	82	(4)
Reclassification to net income	0	0	0	(395)
Deferred tax asset / liability change	0	0	0	158
Unrealized gain (loss) on marketable securities, net of tax	167	77	82	(241)
Total other comprehensive income (loss)	(668)	915	(666)	1,080
Comprehensive loss	$ (26,431)	$ (25,035)	$ (68,502)	$ (51,533)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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