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Fair Value Measurement of Assets and Liabilities (Fair Value of Money Market Funds, Short and Long-Term Investments Classified as Available for Sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | $ 382,452 | $ 376,306
Gross Unrealized Gains |  | 880 | 76
Gross Unrealized Losses | [1] | (195) | (1,099)
Estimated Fair Value |  | 383,137 | 375,283
Cash and Cash Equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 56,537 | 62,219
Gross Unrealized Losses | [1] | (4) | (11)
Estimated Fair Value |  | 56,533 | 62,208
Short-term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 138,744 | 125,627
Gross Unrealized Gains |  | 47 | 5
Gross Unrealized Losses | [1] | (76) | (178)
Estimated Fair Value |  | 138,715 | 125,454
Long-Term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 187,171 | 188,460
Gross Unrealized Gains |  | 833 | 71
Gross Unrealized Losses | [1] | (115) | (910)
Estimated Fair Value |  | 187,889 | 187,621
Money Market Funds [Member] | Cash and Cash Equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 47,669 | 46,423
Estimated Fair Value |  | 47,669 | 46,423
Sovereign Debt Securities [Member] | Short-term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 8,973 | 13,981
Gross Unrealized Gains |  | 3 |
Gross Unrealized Losses | [1] |  | (19)
Estimated Fair Value |  | 8,976 | 13,962
Sovereign Debt Securities [Member] | Long-Term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 56,783 | 55,536
Gross Unrealized Gains |  | 222 | 53
Gross Unrealized Losses | [1] |  | (249)
Estimated Fair Value |  | 57,005 | 55,340
Corporate Debt Securities [Member] | Cash and Cash Equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 8,868 | 15,796
Gross Unrealized Losses | [1] | (4) | (11)
Estimated Fair Value |  | 8,864 | 15,785
Corporate Debt Securities [Member] | Short-term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 118,250 | 103,130
Gross Unrealized Gains |  | 41 | 4
Gross Unrealized Losses | [1] | (73) | (157)
Estimated Fair Value |  | 118,218 | 102,977
Corporate Debt Securities [Member] | Long-Term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 129,386 | 129,921
Gross Unrealized Gains |  | 610 | 18
Gross Unrealized Losses | [1] | (115) | (659)
Estimated Fair Value |  | 129,881 | 129,280
Certificates of Deposit [Member] | Short-term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 11,521 | 8,516
Gross Unrealized Gains |  | 3 | 1
Gross Unrealized Losses | [1] | (3) | (2)
Estimated Fair Value |  | 11,521 | 8,515
Certificates of Deposit [Member] | Long-Term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 1,002 | 3,003
Gross Unrealized Gains |  | 1 |
Gross Unrealized Losses | [1] |  | (2)
Estimated Fair Value |  | $ 1,003 | $ 3,001
[1] | Unrealized losses from securities are primarily attributable to market price movements. Management does not believe any remaining significant unrealized losses represent other-than-temporary impairments based on the evaluation of available evidence including the credit rating of the investments, as of March 31, 2016 and December 31, 2015.

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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