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Recent Accounting Developments (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accumulated deficit	$ (2,280,268)		$ (2,227,214)
Net cash provided by operating activities	151,055	$ 220,074
Net cash used in financing activities	$ 21,976	132,550
Scenario, Adjustment | ASU 2016-09
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cumulative effect on retained earnings, net of tax			1,200
Accumulated deficit			$ 200
Net cash provided by operating activities		200
Net cash used in financing activities		$ 200

X

- Definition

Amount of the cumulative effect on retained earnings net of related income tax effect.

+ References

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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