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Cash and Cash Equivalents and Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash and Cash Equivalents |  |  |
Realized Investment Gains (Losses) | $ 0 | $ 0 | $ 0
Cash |  |  |
Cash and Cash Equivalents |  |  |
Available-for-sale Securities, Amortized Cost Basis | 202,989 | 137,266 |
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments | 0 | 0 |
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0 |
Available-for-sale Securities, Current | 202,989 | 137,266 |
Certificates of Deposit |  |  |
Cash and Cash Equivalents |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 552 |
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments |  | 0 |
Available-for-sale Securities, Gross Unrealized Losses |  | 0 |
Available-for-sale Securities, Current |  | 552 |
US Treasury Securities |  |  |
Cash and Cash Equivalents |  |  |
Available-for-sale Securities, Amortized Cost Basis | 313,105 | 201,584 |
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments | 2 | 3 |
Available-for-sale Securities, Gross Unrealized Losses | (219) | (66) |
Available-for-sale Securities, Current | 312,888 | 201,521 |
Corporate Debt Securities [Member] |  |  |
Cash and Cash Equivalents |  |  |
Available-for-sale Securities, Amortized Cost Basis | 5,477 |  |
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments | 0 |  |
Available-for-sale Securities, Gross Unrealized Losses | (2) |  |
Available-for-sale Securities, Current | 5,475 |  |
Short-term Investments |  |  |
Cash and Cash Equivalents |  |  |
Available-for-sale Securities, Amortized Cost Basis | 318,582 | 202,136 |
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments | 2 | 3 |
Available-for-sale Securities, Gross Unrealized Losses | (221) | (66) |
Available-for-sale Securities, Current | 318,363 | 202,073 |
Cash and Cash Equivalents and Investments |  |  |
Cash and Cash Equivalents |  |  |
Available-for-sale Securities, Amortized Cost Basis | 521,571 | 339,402 |
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments | 2 | 3 |
Available-for-sale Securities, Gross Unrealized Losses | (221) | (66) |
Available-for-sale Securities, Current | $ 521,352 | $ 339,339 |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity 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 and equity 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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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 + Details
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