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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Summary of Adjustments to Quarterly Data Resulting from Adoption of New Standard | Income taxes - Upon adoption of this standard, all excess tax benefits and tax deficiencies (including tax benefits of dividends on share-based payment awards) are recognized as income tax expense or benefit in our consolidated statements of operations. The tax effects of exercised or vested awards are treated as discrete items in the reporting period in which they occur. Adoption of this new standard resulted in the recognition of an excess tax deficiency in our provision for income taxes rather than paid-in capital of $2.1 million for the year ended December 31, 2016 and affected our previously reported first quarter 2016 results as follows (in thousands, except per share data):
|  | For The Three Months Ended March 31, 2016 |
| As Reported |  |  |  | As Adjusted |
Statements of Operations: |  |  |  |  |  |  |
Income tax benefit | $ | (44,038 | ) |  | $ | (41,976 | )
Net loss |  | (91,710 | ) |  |  | (93,772 | )
Basic earnings per share |  | (0.55 | ) |  |  | (0.56 | )
Diluted earnings per share |  | (0.55 | ) |  |  | (0.56 | )
Statements of cash flows - The presentation requirements for cash flows related to employee taxes paid for withheld shares will be adjusted retrospectively. These cash flows have historically been presented as an operating activity. Upon adoption of this new standard, these cash outflows will be classified as a financing activity. Prior periods have been adjusted as follows (in thousands):
|  | As Reported |  |  |  | As Adjusted |
|  | Net cash provided from operating activities |  |  |  | Net cash provided from operating activities |
Year ended 2015 | $ | 683,700 |  |  | $ | 691,402 |
Year ended 2014 |  | 954,135 |  |  |  | 974,353 |
Year ended 2013 |  | 743,538 |  |  |  | 757,373 |
Three months ended March 31, 2016 |  | 87,424 |  |  |  | 90,785 |
Six months ended June 30, 2016 |  | 169,604 |  |  |  | 173,201 |
Nine months ended September 30, 2016 |  | 202,037 |  |  |  | 205,837 |
|  | As Reported |  |  |  | As Adjusted |
|  | Net cash (used in) provided from financing activities |  |  |  | Net cash (used in) provided from financing activities |
Year ended 2015 | $ | (464,905 | ) |  | $ | (472,607 | )
Year ended 2014 |  | 291,421 |  |  |  | 271,203 |
Year ended 2013 |  | 239,994 |  |  |  | 226,159 |
Three months ended March 31, 2016 |  | (72,473 | ) |  |  | (75,834 | )
Six months ended June 30, 2016 |  | (95,411 | ) |  |  | (99,008 | )
Nine months ended September 30, 2016 |  | (35,229 | ) |  |  | (39,029 | )

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- Definition Tabular disclosure of financial statement line items and the effect of the guidance on the financial statement line items if the entity elects early adoption of accounting guidance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 + Details
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