Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Partners' Capital [Abstract]
Net income (loss)	$ 3,052	$ (57,058)	$ (70,312)	$ (180,774)
Other comprehensive income (loss):
Change in foreign currency translation adjustment	(16,858)	(21,368)	(12,746)	(3,055)
Net change on unrealized gains (losses) on available-for-sale investments, net of tax	129	(272)	507	(409)
Other comprehensive income (loss)	(16,729)	(21,640)	(12,239)	(3,464)
Comprehensive income (loss)	$ (13,677)	$ (78,698)	$ (82,551)	$ (184,238)