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Fair Value Measurements and Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2015
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following tables show, by level within the fair value hierarchy, our financial assets and liabilities that are accounted for at fair value on a recurring basis at December 31, 2015 and 2014. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect their placement within the fair value hierarchy.
| December 31, 2015
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |  |  |  |
Money market funds / commercial paper | $ | 41,215 |  |  | $ | 292,412 |  |  | $ | — |  |  | $ | 333,627 |
Equity securities | — |  |  | 24,538 |  |  | — |  |  | 24,538 |
Commingled fixed income securities | — |  |  | 22,571 |  |  | — |  |  | 22,571 |
Debt securities - U.S. and foreign governments, agencies and municipalities | 102,235 |  |  | 12,566 |  |  | — |  |  | 114,801 |
Debt securities - corporate | — |  |  | 62,884 |  |  | — |  |  | 62,884 |
Mortgage-backed / asset-backed securities | — |  |  | 178,234 |  |  | — |  |  | 178,234 |
Derivatives |  |  |  |  |  |  |  |  |
Foreign exchange contracts | — |  |  | 1,716 |  |  | — |  |  | 1,716 |
Total assets | $ | 143,450 |  |  | $ | 594,921 |  |  | $ | — |  |  | $ | 738,371 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts | $ | — |  |  | $ | (5,387 | ) |  | $ | — |  |  | $ | (5,387 | )
Total liabilities | $ | — |  |  | $ | (5,387 | ) |  | $ | — |  |  | $ | (5,387 | )
| December 31, 2014
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |  |  |  |
Money market funds / commercial paper | $ | 505,643 |  |  | $ | 193,986 |  |  | $ | — |  |  | $ | 699,629 |
Equity securities | — |  |  | 27,409 |  |  | — |  |  | 27,409 |
Commingled fixed income securities | — |  |  | 24,077 |  |  | — |  |  | 24,077 |
Debt securities - U.S. and foreign governments, agencies and municipalities | 113,974 |  |  | 24,006 |  |  | — |  |  | 137,980 |
Debt securities - corporate | — |  |  | 67,448 |  |  | — |  |  | 67,448 |
Mortgage-backed / asset-backed securities | — |  |  | 156,614 |  |  | — |  |  | 156,614 |
Derivatives |  |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts | — |  |  | 1,386 |  |  | — |  |  | 1,386 |
Total assets | $ | 619,617 |  |  | $ | 494,926 |  |  | $ | — |  |  | $ | 1,114,543 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts | $ | — |  |  | $ | (2,988 | ) |  | $ | — |  |  | $ | (2,988 | )
Total liabilities | $ | — |  |  | $ | (2,988 | ) |  | $ | — |  |  | $ | (2,988 | )
Available-for-sale Securities | At December 31, 2015 and 2014, available-for-sale securities consisted of the following:
| December 31, 2015
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Estimated fair value
U.S. and foreign governments, agencies and municipalities | $ | 114,265 |  |  | $ | 1,804 |  |  | $ | (1,268 | ) |  | $ | 114,801 |
Corporate | 63,140 |  |  | 823 |  |  | (1,079 | ) |  | 62,884 |
Mortgage-backed / asset-backed securities | 177,821 |  |  | 1,901 |  |  | (1,488 | ) |  | 178,234 |
Total | $ | 355,226 |  |  | $ | 4,528 |  |  | $ | (3,835 | ) |  | $ | 355,919 |
| December 31, 2014
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Estimated fair value
U.S. and foreign governments, agencies and municipalities | $ | 135,839 |  |  | $ | 2,905 |  |  | $ | (764 | ) |  | $ | 137,980 |
Corporate | 66,170 |  |  | 1,569 |  |  | (291 | ) |  | 67,448 |
Mortgage-backed / asset-backed securities | 155,330 |  |  | 2,362 |  |  | (1,078 | ) |  | 156,614 |
Total | $ | 357,339 |  |  | $ | 6,836 |  |  | $ | (2,133 | ) |  | $ | 362,042 |
Schedule of Available-for-sale Securities Reconciliation | At December 31, 2015, the amortized cost and estimated fair value of available-for-sale securities have scheduled maturities as follows:
| Amortized cost |  | Estimated fair value
Within 1 year | $ | 47,014 |  |  | $ | 46,987 |
After 1 year through 5 years | 74,649 |  |  | 75,123 |
After 5 years through 10 years | 53,432 |  |  | 53,753 |
After 10 years | 180,131 |  |  | 180,056 |
Total | $ | 355,226 |  |  | $ | 355,919 |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value | The fair value of our derivative instruments at December 31, 2015 and 2014 was as follows:
|  |  |  | December 31,
Designation of Derivatives |  | Balance Sheet Location |  | 2015 |  | 2014
Derivatives designated as hedging instruments |  |  |  |  |  |  |  |
Foreign exchange contracts |  | Other current assets and prepayments |  | $ | 217 |  |  | $ | 762 |
|  | Accounts payable and accrued liabilities |  | (208 | ) |  | — |
Derivatives not designated as hedging instruments |  |  |  |  |  |  |  |
Foreign exchange contracts |  | Other current assets and prepayments |  | 1,499 |  |  | 624 |
|  | Accounts payable and accrued liabilities |  | (5,179 | ) |  | (2,988 | )
|  | Total derivative assets |  | 1,716 |  |  | 1,386 |
|  | Total derivative liabilities |  | (5,387 | ) |  | (2,988 | )
|  | Total net derivative liability |  | $ | (3,671 | ) |  | $ | (1,602 | )
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location | The following represents the results of cash flow hedging relationships for the years ended December 31, 2015 and 2014:
|  | Year Ended December 31,
|  | Derivative Gain (Loss) Recognized in AOCI (Effective Portion) |  | Location of Gain (Loss) (Effective Portion) |  | Gain (Loss) Reclassified from AOCI to Earnings (Effective Portion)
Derivative Instrument |  | 2015 |  | 2014 |  |  | 2015 |  | 2014
Foreign exchange contracts |  | $ | 887 |  |  | $ | 1,878 |  |  | Revenue |  | $ | 1,082 |  |  | $ | 1,276 |
|  |  |  |  |  |  |  | Cost of sales |  | 558 |  |  | (140 | )
|  |  |  |  |  |  |  |  |  | $ | 1,640 |  |  | $ | 1,136 |
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location | The following represents the results of our non-designated derivative instruments for the years ended December 31, 2015 and 2014:
|  |  |  | Year Ended December 31,
|  |  |  | Derivative Gain (Loss) Recognized in Earnings
Derivatives Instrument |  | Location of Derivative Gain (Loss) |  | 2015 |  | 2014
Foreign exchange contracts |  | Selling, general and administrative expense |  | $ | (6,849 | ) |  | $ | (4,701 | )
Fair Value, by Balance Sheet Grouping | The carrying value and estimated fair value of our debt at December 31, 2015 and 2014 was as follows:
| December 31,
| 2015 |  | 2014
Carrying value | $ | 2,968,997 |  |  | $ | 3,252,006 |
Fair value | $ | 3,102,890 |  |  | $ | 3,440,383 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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