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Long-Term Debt Interest Rates (Details) $ in Thousands, € in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2015 USD ($) | Jan. 31, 2015 USD ($) | Feb. 28, 2017 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2017 EUR (€) | Mar. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 18, 2014 | Dec. 08, 2014 | Nov. 24, 2014 | Dec. 10, 2010 | Jan. 20, 2005
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | $ 778,209 | $ 1,252,302 | $ 2,582,901 |  |  |  |  |
364 Day Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |
Five Year Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | 950,000 |  |  |  |  |  |  |
1.875% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  |  |  |  | $ 3,971 | $ 7,823 |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 1.875% | 1.875% |  | 1.875% | 1.875% |  | 1.875% | 1.875% |  |  |
3.00% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  |  |  |  | $ 0 | $ 1,286 |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 3.00% | 3.00% |  | 3.00% | 3.00% |  |  |  | 3.00% |  |
4.15% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  |  |  |  | $ 3,372 | $ 3,859 |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 4.15% | 4.15% |  |  |  | 4.15% |  |
4.50% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  |  |  |  | $ 891 | $ 2,380 |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 4.50% | 4.50% |  | 4.50% | 4.50% |  |  |  |  | 4.50% |
5.10% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.10%
Repayments of long-term debt | $ 325,000 |  |  |  |  |  |  |  |  |  |  |  |  |
5.45% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  |  |  |  | $ 4,159 | $ 4,313 |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 5.45% | 5.45% |  |  |  | 5.45% |  |
Short-term Debt | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  | 1.67% |  |  |  |  |  |  |  |
Senior Unsecured Cash Bridge Facility | Bridge Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |
Domestic Financial Institution Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |
Foreign Credit Line U S Dollar Euro Denominated Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Other Foreign Credit Lines |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |
Senior Notes | 1.875% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | € |  |  |  |  | € 307.0 |  |  |  |  |  |  |  |  |
Senior Notes | 3.00% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 4.50% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  | $ 174,700 |  |  |  |  |  |  |  |  |  |

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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 Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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