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Long-Term Debt (Narrative) (Amended and Restated Senior Revolving Credit Facility) (Details) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 01, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 | Jun. 08, 2015 | Apr. 30, 2015 USD ($)
Senior Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  | $ 800,000,000
Ability to increase the size of the facility, in increments |  | $ 0 |  |  |
Line of Credit, Increase, Additional Borrowings, Maximum |  | $ 500,000,000 |  |  |
Credit agreement financial covenants, maximum total leverage ratio |  | 3.75 |  |  |
Credit agreement financial covenants, minimum interest coverage ratio |  | 3.50 |  |  |
Senior Revolving Credit Facility [Member] | Letter of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 1,000,000,000.0 | $ 15,000,000.0 |  |  |
Period of debt, in years | 5 years |  |  |  |
Ability to increase the size of the facility, in increments |  | 10,000,000 |  |  |
Senior Revolving Credit Facility [Member] | Swingline Loans For Short Term Borrowings [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  | 15,000,000 |  |  |
Senior Revolving Credit Facility [Member] | Foreign Currency Sublimit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 75,000,000 |  |  |
1.00% Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 1.00% | 1.00% |  |
1.00% Notes [Member] | Convertible Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 1.00% |  | 1.00% |

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- Definition Credit agreement financial covenants, minimum interest coverage ratio + References No definition available. + Details
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- Definition Line of Credit, Increase, Additional Borrowings, Maximum + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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