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Cash and Cash Equivalents and Investments (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash and Cash Equivalents |  |  |
Realized Investment Gains (Losses) | $ 0 | $ 0 | $ 0
Cash |  |  |
Cash and Cash Equivalents |  |  |
Available-for-sale Securities, Amortized Cost Basis | 37,499,000 | 30,423,000 |
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 | 37,499,000 | 30,423,000 |
Certificates of Deposit |  |  |
Cash and Cash Equivalents |  |  |
Available-for-sale Securities, Amortized Cost Basis | 552,000 | 551,000 |
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 | 552,000 | 551,000 |
US Treasury Securities |  |  |
Cash and Cash Equivalents |  |  |
Available-for-sale Securities, Amortized Cost Basis | 91,075,000 | 192,211,000 |
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments | 3,000 | 24,000 |
Available-for-sale Securities, Gross Unrealized Losses | (1,000) | (1,000) |
Available-for-sale Securities, Current | 91,077,000 | 192,234,000 |
Short-term Investments |  |  |
Cash and Cash Equivalents |  |  |
Available-for-sale Securities, Amortized Cost Basis | 91,627,000 | 192,762,000 |
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments | 3,000 | 24,000 |
Available-for-sale Securities, Gross Unrealized Losses | (1,000) | (1,000) |
Available-for-sale Securities, Current | 91,629,000 | 192,785,000 |
Cash and Cash Equivalents and Investments |  |  |
Cash and Cash Equivalents |  |  |
Available-for-sale Securities, Amortized Cost Basis | 129,126,000 | 223,185,000 |
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments | 3,000 | 24,000 |
Available-for-sale Securities, Gross Unrealized Losses | (1,000) | (1,000) |
Available-for-sale Securities, Current | $ 129,128,000 | $ 223,208,000 |

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- Definition This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + 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=28360136&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=6871852&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Subparagraph a -Article 7 + Details
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