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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements Of Comprehensive Income [Abstract]
Net income (loss)	$ 7,799	$ 17,831	$ (4,899)	$ 44,460
Other comprehensive income (loss):
Foreign currency translation adjustments	(249)	1,313	(1,569)	4,434
Unrealized gain on investments, net of tax	0	3	41	19
Unrealized gain on derivative, net of tax	82	89	1,159	254
Other	0	0	0	(13)
Other comprehensive income (loss)	(167)	1,405	(369)	4,694
Comprehensive income (loss)	$ 7,632	$ 19,236	$ (5,268)	$ 49,154

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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, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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