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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 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | $ 373,266 | $ 346,677
Gross Unrealized Gains |  | 217 | 25
Gross Unrealized Losses | [1] | (260) | (603)
Estimated Fair Value |  | 373,223 | 346,099
Cash and Cash Equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 65,145 | 50,540
Gross Unrealized Gains |  | 33 | 2
Gross Unrealized Losses | [1] | (3) | (43)
Estimated Fair Value |  | 65,175 | 50,499
Time Deposits [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 98,763 | 90,414
Gross Unrealized Gains |  | 13 | 1
Gross Unrealized Losses | [1] | (52) | (80)
Estimated Fair Value |  | 98,724 | 90,335
Long-Term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 209,358 | 205,723
Gross Unrealized Gains |  | 171 | 22
Gross Unrealized Losses | [1] | (205) | (480)
Estimated Fair Value |  | 209,324 | 205,265
Money Market Funds [Member] | Cash and Cash Equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 52,781 | 37,531
Gross Unrealized Gains |  | 33 | 2
Gross Unrealized Losses | [1] |  | (38)
Estimated Fair Value |  | 52,814 | 37,495
Sovereign Debt Securities [Member] | Cash and Cash Equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 327 |
Estimated Fair Value |  | 327 |
Sovereign Debt Securities [Member] | Time Deposits [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 3,273 | 4,726
Gross Unrealized Gains |  | 0 |
Gross Unrealized Losses | [1] | (6) | (4)
Estimated Fair Value |  | 3,267 | 4,722
Sovereign Debt Securities [Member] | Long-Term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 52,489 | 44,511
Gross Unrealized Gains |  | 62 |
Gross Unrealized Losses | [1] | (2) | (83)
Estimated Fair Value |  | 52,549 | 44,428
Corporate Debt Securities [Member] | Cash and Cash Equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 12,037 | 13,009
Gross Unrealized Losses | [1] | (3) | (5)
Estimated Fair Value |  | 12,034 | 13,004
Corporate Debt Securities [Member] | Time Deposits [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 88,476 | 81,886
Gross Unrealized Gains |  | 9 |
Gross Unrealized Losses | [1] | (46) | (75)
Estimated Fair Value |  | 88,439 | 81,811
Corporate Debt Securities [Member] | Long-Term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 154,369 | 157,205
Gross Unrealized Gains |  | 108 | 22
Gross Unrealized Losses | [1] | (203) | (395)
Estimated Fair Value |  | 154,274 | 156,832
Certificates of Deposit [Member] | Time Deposits [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 7,014 | 3,802
Gross Unrealized Gains |  | 4 | 1
Gross Unrealized Losses | [1] |  | (1)
Estimated Fair Value |  | 7,018 | 3,802
Certificates of Deposit [Member] | Long-Term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 2,500 | 4,007
Gross Unrealized Gains |  | 1 |
Gross Unrealized Losses | [1] |  | (2)
Estimated Fair Value |  | $ 2,501 | $ 4,005
[1] | Unrealized losses from securities are primarily attributable to market price movements. Management does not believe any remaining unrealized losses represent other-than-temporary impairments based on the evaluation of available evidence including the credit rating of the investments, as of June 30, 2015 and December 31, 2014.

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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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