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Convertible Notes Long Term Debt and Credit Facility (Details Textual) (USD $) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  | 3 Months Ended | 1 Months Ended | 6 Months Ended |  | 3 Months Ended | 1 Months Ended | 6 Months Ended |  |  | 6 Months Ended |  | 3 Months Ended |  |
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Nov. 30, 2011 | Sep. 23, 2011 | Jun. 30, 2011 | Sep. 23, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Mar. 31, 2010 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Feb. 29, 2008 | Feb. 11, 2008 | Mar. 31, 2010 Term loan [Member] | May 31, 2011 2008 Notes [Member] | Feb. 14, 2008 2008 Notes [Member] | Jun. 30, 2012 2008 Notes [Member] | Jun. 25, 2012 2008 Notes [Member] | Mar. 31, 2011 Senior credit facility [Member] | Jan. 31, 2012 2010 Notes [Member] | Feb. 14, 2008 2010 Notes [Member] | Jun. 30, 2012 2010 Notes [Member] | Jan. 05, 2012 2010 Notes [Member] | Mar. 31, 2010 2010 Notes [Member] | Jun. 30, 2012 Exchange agreement [Member] | Mar. 31, 2010 Exchange agreement [Member] | Mar. 31, 2010 Annual interest rate 12.5% [Member] Term loan [Member] | Sep. 23, 2011 Letters of Credit Sublimit [Member] | Jun. 30, 2012 Federal funds open rate [Member] | Jun. 30, 2012 One-Month LIBOR Rate [Member] | Jun. 30, 2012 One two or three month LIBOR rate [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, current borrowing capacity |  | $ 35,000,000 |  | $ 35,000,000 |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount of credit facility |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |
Credit facility, variable percentage rate spread |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% | 2.00% | 2.00%
Debt instrument, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan, face amount |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, interest rate |  |  |  |  |  |  |  | 5.25% |  |  |  |  |  |  | 5.25% |  |  |  |  | 5.25% |  |  |  |  |  |  |  |  |  |
Convertible notes maturity date |  |  |  |  |  |  | Nov. 01, 2012 |  |  |  |  |  |  |  |  | Feb. 15, 2028 |  |  |  |  | Feb. 15, 2028 |  |  |  |  |  |  |  |  |
Nonconvertible debt borrowing interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term for accretion of associated debt discount (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual call/put options, exercisable date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 15, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount on notes |  |  |  |  |  |  |  | 2,269,000 |  | 6,766,000 |  |  |  |  | 27,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax liability on notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  | 36,000,000 |  |  |  |  |  |  |  |
Percentage of original principal amount of notes plus accrued and unpaid interest equalized repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102.00% |  |  |  |  | 104.95% |  |  |  |  |  |  |  |
Amount of cash premium included in loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Nov. 01, 2012 |  |  |  |  |  |  |  |  | Feb. 15, 2028 |  |  |  |  | Feb. 15, 2028 |  |  |  |  |  |  |  |  |
Senior credit facility, value of common stock converted |  |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |
Convertible notes for each $1,000 principal amount, amount of notes exchanged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, amount of aggregate consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,000,000 |  |  |  |  |  |  |  |  |
Redeemable price as a percentage of outstanding principal note amount |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  | 104.95% |  |  |  |  |  |  |  |  |  |  |
Amount of notes exchanged |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 |  |  |  |  | 36,000,000 |  |  |  |  |  |  |  |  |  |  |
Loss on the extinguishment of debt |  |  | 2,100,000 |  |  |  |  | 1,000,000 |  |  |  |  |  | 1,100,000 |  |  |  |  | 5,400,000 |  |  |  |  |  |  |  |  |  |  |
Accretion of debt discount |  |  |  |  | 1,200,000 | 1,300,000 |  | 2,031,000 | 2,657,000 |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |  |  |  |
Contingent interest percentage on principal amount of notes, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120.00% |  |  |  |  |  |
Contingent interest payable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, value of shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, number of shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 559,007 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan, quarterly principal payments |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Term loan, annual interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.50% |  |  |  |
Convertible notes for each $1000 principal amount, principal amount of 2010 Notes converted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900 |  |  |  |  |  |  |
Return of borrowed shares under share-based, shares | 701,102 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes Long Term Debt and Credit Facility (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, expiration date |  | Dec. 15, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Added to Federal Funds Open Rate for the Calculation of Interest on Borrowings |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% | 2.00% | 2.00%
Credit facility, extended maturity date |  | September 22, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, interest rate at period end |  |  |  |  |  |  |  | 4.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, commitment fee percentage |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, financial covenant debt ratio upper range |  |  |  |  |  |  |  | 110.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, financial covenant debt ratio lower range |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, covenant terms |  |  |  | The Credit Facility is secured by substantially all of the Company’s personal property, including accounts receivable, inventory, equipment and other intangible assets and contains customary representations, warranties, and both affirmative and negative covenants, including a financial covenant to maintain consolidated earnings before interest, taxes, depreciation and amortization (“EBITDA”) to debt ratio of 1.10 to 1.00 and an annual limit on capital expenditures. The Credit Facility restricts the payment of cash dividends on common stock. In the event of default, the Lender may accelerate the maturity date of outstanding amounts borrowed under the Credit Facility. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, interest rate description |  | Interest on borrowings under the Credit Facility is calculated daily at the higher of (a) the commercial lending base rate of PNC Bank plus 1%, (b) the federal funds open rate plus 1.5%, and (c) the daily one-month LIBOR rate plus 2%. The interest rate on borrowings would have been 4.25% at June 30, 2012. The Company may elect to borrow any amount available under the Credit Facility for a term of one, two or three months at LIBOR plus 2%. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective tax rate |  |  |  |  |  |  |  | 38.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, volume-weighted average price of common stock rate |  |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, number of preceding trading days |  |  |  |  |  |  | 10 days | 5 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, number of shares |  |  |  |  |  |  |  | 43.9560 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, conversion price per share |  |  |  |  |  |  |  | $ 22.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share lending agreement, number of common stock shares loaned |  |  |  |  |  |  |  | 3,800,000 |  |  |  | 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Own share lending arrangement nominal loan fee per share |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowed shares outstanding |  |  |  |  |  |  |  | 3,098,898 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share lending agreement, fair value |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share lending agreement, unamortized debt issuance costs |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares not subject to the share lending arrangement, fair value |  |  |  |  |  |  |  | 28,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital lease obligations |  |  |  |  |  |  |  | $ 1,990,000 |  | $ 1,642,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 + Details
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