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Fair Value Of Financial Instruments (Fair Value, Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative Financial Instruments, Liabilities, Fair Value Disclosure | $ 14,339 | $ 30,126
Measured On A Recurring Basis [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total fair value of assets | 1,763,970 | 1,824,595
Total fair of value of liabilities | 14,426 | 30,290
Measured On A Recurring Basis [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total fair value of assets | 1,763,728 | 1,824,365
Total fair of value of liabilities | 0 | 0
Measured On A Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total fair value of assets | 242 | 230
Total fair of value of liabilities | 87 | 164
Measured On A Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total fair value of assets | 0 | 0
Total fair of value of liabilities | 14,339 | 30,126
Money Market Funds [Member] | Measured On A Recurring Basis [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in money market funds | 134,790 | 137,593
Money Market Funds [Member] | Measured On A Recurring Basis [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in money market funds | 134,790 | 137,593
Money Market Funds [Member] | Measured On A Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in money market funds | 0 | 0
Money Market Funds [Member] | Measured On A Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in money market funds | 0 | 0
US Treasury and Government [Member] | Measured On A Recurring Basis [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, Fair Value Disclosure | 1,626,764 | 1,685,882
US Treasury and Government [Member] | Measured On A Recurring Basis [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, Fair Value Disclosure | 1,626,764 | 1,685,882
US Treasury and Government [Member] | Measured On A Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, Fair Value Disclosure | 0 | 0
US Treasury and Government [Member] | Measured On A Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, Fair Value Disclosure | 0 | 0
Equity Securities [Member] | Measured On A Recurring Basis [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, Fair Value Disclosure | 2,174 | 890
Equity Securities [Member] | Measured On A Recurring Basis [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, Fair Value Disclosure | 2,174 |
Foreign currency forward contracts (assets) |  | 890
Equity Securities [Member] | Measured On A Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, Fair Value Disclosure | 0 |
Foreign currency forward contracts (assets) |  | 0
Equity Securities [Member] | Measured On A Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, Fair Value Disclosure | 0 |
Foreign currency forward contracts (assets) |  | 0
Forward Contracts [Member] | Measured On A Recurring Basis [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Foreign currency forward contracts (assets) | 242 | 230
Foreign currency forward contracts (liability) | 87 | 164
Forward Contracts [Member] | Measured On A Recurring Basis [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Foreign currency forward contracts (assets) | 0 | 0
Foreign currency forward contracts (liability) | 0 | 0
Forward Contracts [Member] | Measured On A Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Foreign currency forward contracts (assets) | 242 | 230
Foreign currency forward contracts (liability) | 87 | 164
Forward Contracts [Member] | Measured On A Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Foreign currency forward contracts (assets) | 0 | 0
Foreign currency forward contracts (liability) | 0 | 0
Embedded Derivative Financial Instruments [Member] | Measured On A Recurring Basis [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative Financial Instruments, Liabilities, Fair Value Disclosure | 14,339 | 30,126
Embedded Derivative Financial Instruments [Member] | Measured On A Recurring Basis [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative Financial Instruments, Liabilities, Fair Value Disclosure | 0 | 0
Embedded Derivative Financial Instruments [Member] | Measured On A Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative Financial Instruments, Liabilities, Fair Value Disclosure | 0 | 0
Embedded Derivative Financial Instruments [Member] | Measured On A Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative Financial Instruments, Liabilities, Fair Value Disclosure | $ 14,339 | $ 30,126

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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