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Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2017
Accounting Policies [Abstract] |
Summary Of The Most Significant Impacts Of The New Accounting Guidance |
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﻿Description of Change: |  | Impact of Change: |  | Adoption Method:
﻿Tax benefits related to share-based payments at settlement are recorded through the income statement instead of equity |  | Decreases in income tax expense by approximately $3.8 million for the three months ended September 30, 2017, and approximately $22.1 million for the nine months ended September 30, 2017 |  | Prospective (required)
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﻿Calculation of diluted shares outstanding under the treasury method will no longer assume that tax benefits related to share-based payments are used to repurchase common stock |  | Increase in the weighted average diluted shares outstanding by approximately 450,000 shares for both the three and nine months ended September 30, 2017 |  | Prospective (required)
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﻿An election can be made to reduce share-based compensation expense for forfeitures as they occur instead of estimating forfeitures that are expected to occur |  | No change to share-based compensation expense, as we have elected to continue to estimate forfeitures that are expected to occur |  | N/A
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﻿Tax benefits related to share-based payments at settlement are classified as operating cash flows instead of financing cash flows |  | Increases in cash flow from operating activities and decreases in cash flow from financing activities by approximately $22.1 million for the nine months ended September 30, 2017 |  | Prospective (elected)
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﻿Cash payments to tax authorities for shares withheld to meet employee tax withholding requirements on restricted stock units are classified as financing cash flow instead of operating cash flow |  | Increases in cash flow from operating activities and decreases in cash flow from financing activities for the nine months ended September 30, 2017 and 2016 by approximately $7.8 and $3.7 million, respectively |  | Retrospective (required)
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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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