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Fair Value Measurements (Fair Value of Other Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Convertible senior notes [Member] | 2008 Notes [Member] | Carrying Value [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Long-term debt | $ 0 | [1] | $ 5,133 | [1]
Convertible senior notes [Member] | 2008 Notes [Member] | Fair Value [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Long-term debt | 0 | [1] | 5,163 | [1]
Term loan [Member] | Term Loan 2012 [Member] | Carrying Value [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Long-term debt | 45,833 |  | 25,000 |
Term loan [Member] | Term Loan 2012 [Member] | Fair Value [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Long-term debt | 45,833 |  | 25,000 |
Capital lease obligations [Member] | Carrying Value [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Capital lease obligations | 0 |  | 1,784 |
Capital lease obligations [Member] | Fair Value [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Capital lease obligations | $ 0 |  | $ 1,736 |
[1] | The carrying value of the 2008 Notes represents the discounted debt component only, while the fair value of the Notes is based on the market value of the respective notes, including convertible equity features.

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- Definition This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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