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Convertible Notes, Long-Term Debt and Credit Facility - Credit Facility (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Line of Credit Facility [Line Items] |  |
Credit facility, financial covenant, EBITDA to debt ratio, upper range | 1.10 |
Credit facility, financial covenant, funded debt to adjusted EBITDA ratio | 4.0 |
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 |
Amount borrowed | 54,973,000 | 62,105,000
Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Annual limit on capital expenditures | 36,000,000 |
Line of Credit [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | 75,000,000.0 |
Credit facility, commitment fee percentage | 0.25% |
Credit facility, amount outstanding | 13,900,000 |
Credit facility, availability | 74,800,000 |
Credit facility, available borrowing capacity, net of outstanding borrowings | 60,900,000 |
Letter of Credit [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | 10,000,000 |
Term loan [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt, face amount | 50,000,000.0 |
Amount borrowed | 41,048,000 | 45,833,000
Monthly principal payments | 600,000 |
PNC Bank Base Rate [Member] | Term loan [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt, interest rate at period end | 4.50% |
Amount borrowed | 100,000 |
London Interbank Lending Rate (LIBOR) [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Base lending rate | 3.25% |
Credit facility, interest rate at period end | 1.65% |
London Interbank Lending Rate (LIBOR) [Member] | Term loan [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt, interest rate at period end | 2.41% |
Amount borrowed | $ 41,000,000 |
Minimum [Member] | PNC Bank Base Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility, variable percentage rate spread | 0.50% |
Minimum [Member] | PNC Bank Base Rate [Member] | Term loan [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility, variable percentage rate spread | 1.25% |
Minimum [Member] | London Interbank Lending Rate (LIBOR) [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility, variable percentage rate spread | 1.50% |
Minimum [Member] | London Interbank Lending Rate (LIBOR) [Member] | Term loan [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility, variable percentage rate spread | 2.25% |
Maximum [Member] | PNC Bank Base Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility, variable percentage rate spread | 1.00% |
Maximum [Member] | PNC Bank Base Rate [Member] | Term loan [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility, variable percentage rate spread | 1.75% |
Maximum [Member] | London Interbank Lending Rate (LIBOR) [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility, variable percentage rate spread | 2.00% |
Maximum [Member] | London Interbank Lending Rate (LIBOR) [Member] | Term loan [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility, variable percentage rate spread | 2.75% |

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- Definition Amount Company Will Prepay on Term Loan Due To Covenant Requirement + References No definition available. + Details
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- Definition Covenant, Maximum Number of Days From Year End By Which Prepayment of 25% of Adjusted EBTDA is Due + References No definition available. + Details
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- Definition Covenant, Percent of Adjusted EBITDA Which Must Be Prepaid + References No definition available. + Details
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- Definition Credit Facility Ceiling Value, Applicable to 25% Of Adjusted EBITDA Which Must Be Paid + References No definition available. + Details
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- Definition Excess Cash Flow Minimum Achieved Under Loan Covenant + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Compliance, Capital Expenditures + References No definition available. + Details
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- Definition Line of Credit Facility, Debt Covenant, Ratio of Debt to Adjusted EBITDA + References No definition available. + Details
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- Definition Line of Credit Facility, Financial Covenant, Earnings Before Interest Taxes Depreciation and Amortization to Debt Ratio + References No definition available. + 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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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- 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 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 Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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