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Convertible Notes, Long-Term Debt and Credit Facility Convertible Notes, Long-Term Debt and Credit Facility (Credit Facility) (Details) (USD $) | 12 Months Ended |  |  |
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Dec. 31, 2013 | Dec. 31, 2013 Line of Credit [Member] | Dec. 31, 2013 Term loan [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] Line of Credit [Member] | Dec. 31, 2013 Term loan [Member] Line of Credit [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 75,000,000.0 |
Maturity date |  |  | May 10, 2018 |  |  |  |
Amount borrowed |  |  |  | 16,272,000 | 0 | 16,300,000 | 50,000,000
Credit facility, financial covenant debt ratio upper range | 110.00% |  |  |  |  |  |
Credit facility, financial covenant debt ratio lower range | 100.00% |  |  |  |  |  |
Covenant, Maximum Funded Debt to Adjusted EBITDA | 4.0 |  |  |  |  |  |
Annual limit on capital expenditures |  | 36,000,000 |  |  |  |  |
Covenant, Percent of Adjusted EBITDA Which Must Be Prepaid | 25.00% |  |  |  |  |  |
Credit Facility Ceiling Value, Applicable to 25% Of Adjusted EBITDA Which Must Be Paid | 3,000,000 |  |  |  |  |  |
Covenant, Maximum Number of Days From Year End By Which Prepayment of 25% of Adjusted EBTDA is Due | 60 days |  |  |  |  |  |
Excess Cash Flow Minimum Achieved Under Loan Covenant | 3,000,000 |  |  |  |  |  |
Amount Company Will Prepay on Term Loan Due To Covenant Requirement | $ 3,000,000 |  |  |  |  |  |

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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