CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands		Total		Common Stock	Additional Paid-in Capital	Company Common Stock Held By The NQDC	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning Balance at Dec. 31, 2016							$ 12,816
Net loss		$ (53,123)
Ending Balance at Jun. 30, 2017							(14,658)
Beginning Balance at Mar. 31, 2017							5,020
Net loss		(36,833)
Ending Balance at Jun. 30, 2017							(14,658)
Beginning Balance at Dec. 31, 2017		2,808,663	[1]	$ 176	$ 4,483,220	$ (14,224)	(22,961)	$ (1,637,548)
Beginning Balance (in shares) at Dec. 31, 2017				175,844
Impact of change in accounting principle at Dec. 31, 2017	[2]						(586)
Impact of change in accounting principle (ASC 606) at Dec. 31, 2017		20,048						20,048
Impact of change in accounting principle (ASU 2018-02) at Dec. 31, 2017							(586)	586
Adjusted balance at January 1, 2018 at Dec. 31, 2017		2,828,711		$ 176	4,483,220	(14,224)	(23,547)	(1,616,914)
Net loss		(60,941)						(60,941)
Other comprehensive income		22,418					22,418
Issuances under equity incentive plans, net of tax		16,312		$ 2	16,310
Issuances under equity incentive plans, net of tax (in share)				1,664
Common stock held by the NQDC		834				834
Stock-based compensation		77,770			77,770
Ending Balance at Jun. 30, 2018		2,885,104		$ 178	4,577,300	(13,390)	(1,129)	(1,677,855)
Ending Balance (in shares) at Jun. 30, 2018				177,508
Beginning Balance at Mar. 31, 2018							(28,545)
Net loss		(16,792)
Ending Balance at Jun. 30, 2018		$ 2,885,104		$ 178	$ 4,577,300	$ (13,390)	$ (1,129)	$ (1,677,855)
Ending Balance (in shares) at Jun. 30, 2018				177,508

[1] December 31, 2017 balances were derived from the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on February 26, 2018.

[2] As of January 1, 2018, the Company early adopted the requirements of ASU 2018-02. The amount represents the reclassification from Accumulated Other Comprehensive Income (Loss) to Accumulated Deficit in the first quarter of 2018 related to the adoption of ASU 2018-02. See Note 4 for additional discussion