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Fair Value Measurements and Derivative Instruments (Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | $ 738,371 | $ 1,114,543
Liabilities | (5,387) | (2,988)
Level 1 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 143,450 | 619,617
Liabilities | 0 | 0
Level 2 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 594,921 | 494,926
Liabilities | (5,387) | (2,988)
Level 3 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Money market funds / commercial paper |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 333,627 | 699,629
Money market funds / commercial paper | Level 1 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 41,215 | 505,643
Money market funds / commercial paper | Level 2 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 292,412 | 193,986
Money market funds / commercial paper | Level 3 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Equity securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 24,538 | 27,409
Equity securities | Level 1 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Equity securities | Level 2 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 24,538 | 27,409
Equity securities | Level 3 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Commingled fixed income securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 22,571 | 24,077
Commingled fixed income securities | Level 1 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Commingled fixed income securities | Level 2 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 22,571 | 24,077
Commingled fixed income securities | Level 3 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Debt securities - U.S. and foreign governments, agencies and municipalities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 114,801 | 137,980
Debt securities - U.S. and foreign governments, agencies and municipalities | Level 1 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 102,235 | 113,974
Debt securities - U.S. and foreign governments, agencies and municipalities | Level 2 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 12,566 | 24,006
Debt securities - U.S. and foreign governments, agencies and municipalities | Level 3 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Debt securities - corporate |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 62,884 | 67,448
Debt securities - corporate | Level 1 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Debt securities - corporate | Level 2 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 62,884 | 67,448
Debt securities - corporate | Level 3 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Mortgage-backed / asset-backed securities |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 178,234 | 156,614
Mortgage-backed / asset-backed securities | Level 1 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Mortgage-backed / asset-backed securities | Level 2 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 178,234 | 156,614
Mortgage-backed / asset-backed securities | Level 3 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Foreign exchange contracts |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 1,716 | 1,386
Liabilities | (5,387) | (2,988)
Foreign exchange contracts | Level 1 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Foreign exchange contracts | Level 2 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 1,716 | 1,386
Liabilities | (5,387) | (2,988)
Foreign exchange contracts | Level 3 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Liabilities | $ 0 | $ 0

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