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Long-Term Debt (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Write-off debt issuance costs | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 1,326,000 | $ 0 | $ 0 | $ 1,326,000 | $ 0
Credit Facility maximum borrowing capacity | 117,800,000 |  |  |  |  |  |  |  | 117,800,000 |  |
Unused borrowing capacity under the revolving credit Facility | 60,000,000 |  |  |  |  |  |  |  | 60,000,000 |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.00% |  |  |  |  |  |  |  | 5.00% |  |
Credit facility matures |  |  |  |  |  |  |  |  | Jun. 13, 2016 |  |
Line of credit facility future available borrowing capacity | 40,000,000 |  |  |  |  |  |  |  | 40,000,000 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  |  |  |  |  | 0.375% |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  |  |  |  |  | 0.25% |  |
Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.75% |  |  |  |  |  |  |  | 1.75% |  |
Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |  |  |  |  |  |  |  | 0.50% |  |
LIBOR Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 0.2117% |  |  |  |  |  |  |  | 0.2117% |  |
LIBOR Rate | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.75% |  |  |  |  |  |  |  | 2.75% |  |
LIBOR Rate | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50% |  |  |  |  |  |  |  | 1.50% |  |
Term loan [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit Facility maximum borrowing capacity | 57,800,000 |  |  |  |  |  |  |  | 57,800,000 |  |
Term loan principal amortization rate |  |  |  |  |  |  |  |  | 5.00% |  |
Revolving credit facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit Facility maximum borrowing capacity | 60,000,000 |  |  |  |  |  |  |  | 60,000,000 |  |
Unused borrowing capacity under the revolving credit Facility | $ 60,000,000 |  |  |  |  |  |  |  | $ 60,000,000 |  |

X
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- Definition Term loan principal amortization rate. + References No definition available. + 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 Date the credit facility terminates, in CCYY-MM-DD format. + 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 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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