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Cash and Cash Equivalents and Fair Value of Financial Instruments - Schedule of Cash and Cash Equivalents (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and cash equivalents, Amortized Cost | $ 126,379 | $ 104,531 | $ 87,334 | $ 62,313
Cash, cash equiv and S-T-I: Amortized cost | 126,379 | 104,531 |  |
Cash, cash equiv and S-T-I: Gross unrealized gains | 0 | 0 |  |
Cash, cash equiv and S-T-I: Gross unrealized losses | 0 | 0 |  |
Cash, Cash Equivalents, and Short-term Investments | 126,379 | 104,531 |  |
Cash |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and cash equivalents, Amortized Cost | 68,333 | 38,823 |  |
Cash and cash equivalents - gross unrealized gain | 0 | 0 |  |
Cash and cash equivalents - Gross unrealized losses | 0 | 0 |  |
Cash and Cash Equivalents, Fair Value Disclosure | 68,333 | 38,823 |  |
Money Market Funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and cash equivalents, Amortized Cost | 58,046 | 65,708 |  |
Cash and cash equivalents - gross unrealized gain | 0 | 0 |  |
Cash and cash equivalents - Gross unrealized losses | 0 | 0 |  |
Cash and Cash Equivalents, Fair Value Disclosure | 58,046 | 65,708 |  |
Cash and Cash Equivalents |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash, Cash Equivalents, and Short-term Investments | 126,379 | 104,531 |  |
Cash and Cash Equivalents | Cash |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 68,333 | 38,823 |  |
Cash and Cash Equivalents | Money Market Funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | $ 58,046 | $ 65,708 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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