Long-Term Obligations (Parenthetical) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Convertible senior notes interest rate	5.00%	5.00%
Convertible Notes Payable
Debt Instrument [Line Items]
Convertible senior notes interest rate	5.00%	5.00%
Debt Instrument, Maturity Date	Oct. 01, 2017
Loan Agreement
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	5.50%	5.50%
Debt Instrument, Unamortized Discount (Premium), Net	$ 153	$ 326
Debt Instrument, Maturity Date	May 01, 2015
Financing Lease Obligations
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	4.90%	4.90%
Debt Instrument, Maturity Date	Oct. 01, 2026
Capital Lease Obligations
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	$ 71	$ 117
Debt Instrument, Maturity Date	Jan. 01, 2016

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28567-108399

Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

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-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 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