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Convertible Notes, Long-Term Debt and Credit Facility Convertible Notes, Long-Term Debt and Credit Facility (Revolving Credit Facility) (Details) (USD $) |  |  | 12 Months Ended |
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Dec. 31, 2013 Revolving Credit Facility [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] | Dec. 31, 2013 Line of Credit [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Term loan [Member] | Dec. 31, 2013 Letter of Credit [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 PNC Bank base lending rate [Member] Line of Credit [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 LIBOR [Member] Line of Credit [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Minimum [Member] PNC Bank base lending rate [Member] Line of Credit [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Minimum [Member] PNC Bank base lending rate [Member] Term loan [Member] | Dec. 31, 2013 Minimum [Member] LIBOR [Member] Line of Credit [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Maximum [Member] PNC Bank base lending rate [Member] Line of Credit [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Maximum [Member] PNC Bank base lending rate [Member] Term loan [Member] | Dec. 31, 2013 Maximum [Member] LIBOR [Member] Line of Credit [Member] Revolving Credit Facility [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 75,000,000.0 |  | $ 10,000,000 |  |  |  |  |  |  |  |
Maturity date |  |  |  | May 10, 2018 |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 0.50% | 1.25% | 1.50% | 1.00% | 1.75% | 2.00%
Base lending rate |  |  |  |  |  |  | 3.25% |  |  |  |  |  |
Monthly facility fee |  |  | 0.25% |  |  |  |  |  |  |  |  |  |
Amount borrowed | 16,272,000 | 0 | 16,300,000 |  |  | 1,300,000 | 15,000,000 |  |  |  |  |  |
Interest Rate at Period End |  |  |  |  |  | 3.75% | 1.67% |  |  |  |  |  |
Credit facility, current borrowing capacity |  |  | $ 71,900,000 |  |  |  |  |  |  |  |  |  |

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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The effective interest rate at the end of the reporting period. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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