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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 |

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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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