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Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 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 for the Three Months Ended March 31, 2017 and 2016 if applicable: |  | Adoption Method:
﻿Tax benefits related to share-based payments at settlement are recorded through the income statement instead of equity |  | Decrease in income tax expense by approximately $11.2 million for the three months ended March 31, 2017 |  | Prospective (elected)
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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 the three months ended March 31, 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 |  | Increase in cash flow from operating activities and decrease in cash flow from financing activities by approximately $11.2 million for the three months ended March 31, 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 |  | Increase in cash flow from operating activities and decrease in cash flow from financing activities for the three months ended March 31, 2017 and 2016 by approximately $7.3 million and $3.8 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 -Glossary Direct Effects of a Change in Accounting Principle -URI http://asc.fasb.org/extlink&oid=66092750 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Indirect Effects of a Change in Accounting Principle -URI http://asc.fasb.org/extlink&oid=6515603 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accounting Change -URI http://asc.fasb.org/extlink&oid=6503790 Reference 6: 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 7: 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 8: 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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Change in Accounting Principle -URI http://asc.fasb.org/extlink&oid=6507316 Reference 10: 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 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Retrospective Application -URI http://asc.fasb.org/extlink&oid=6523989 + Details
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