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Fair Value Measurements - Fair Value of Other Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified

Sep. 30, 2013

Dec. 31, 2012

Carrying Value [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Marketable Securities

$ 220

$ 0

Borrowings under revolving credit facility

27,377

0

Carrying Value [Member] | Capital Lease Obligations [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Capital lease obligations

1,643

1,784

Fair Value [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Marketable Securities

220

0

Borrowings under revolving credit facility

27,377

0

Fair Value [Member] | Capital Lease Obligations [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Capital lease obligations

1,601

1,736

2008 Notes [Member] | Carrying Value [Member] | Convertible Debt [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

0

^[1]

5,133

^[1]

2008 Notes [Member] | Fair Value [Member] | Convertible Debt [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

0

^[1]

5,163

^[1]

2012 Term Loan [Member] | Carrying Value [Member] | Term loan [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

47,619

25,000

2012 Term Loan [Member] | Fair Value [Member] | Term loan [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

$ 47,619

$ 25,000

[1]	The carrying value of the 2008 Notes represents the discounted debt component only, while the fair value of the Notes is based on the market value of the respective notes, including convertible equity features.

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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