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Convertible Notes, Long-Term Debt and Credit Facility (Term Loan) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |
Debt outstanding | $ 62,105,000 |
Term loan [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | 50,000,000 |
Monthly principal payments | 600,000 |
Maturity date | May 10, 2018 |
Percentage of Value of Equipment Held by Lender as Security | 85.00% |
Eighty-Five Percent of Value of Pledged Equipment Collateral | 18,300,000 |
Percent of FMV of Domestic Lands and Buildings Which Will Support Outstanding Loan Balance as Collateral When Lender Has Secured Related Lien | 75.00% |
Debt outstanding | 45,833,000 | 25,000,000
PNC Bank base lending rate [Member] | Term loan [Member] |  |
Debt Instrument [Line Items] |  |
Debt outstanding | 800,000 |
Interest rate at period end | 4.50% |
LIBOR [Member] | Term loan [Member] |  |
Debt Instrument [Line Items] |  |
Debt outstanding | $ 45,000,000 |
Interest rate at period end | 2.42% |
Minimum [Member] | PNC Bank base lending rate [Member] | Term loan [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.25% |
Maximum [Member] | PNC Bank base lending rate [Member] | Term loan [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.75% |
Term loan [Member] | Minimum [Member] | LIBOR [Member] | Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.25% |
Term loan [Member] | Maximum [Member] | LIBOR [Member] | Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.75% |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + 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 FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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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