Long-Term Debt	9 Months Ended
Sep. 30, 2011
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt. In connection with our acquisition of BioSphere, we entered into the Credit Agreement with the Lenders and Wells Fargo. Pursuant to the terms of the Credit Agreement, the Lenders have agreed to make revolving credit loans up to an aggregate principal amount of $125 million. Wells Fargo has also agreed to make swing line loans from time to time through the maturity date of September 10, 2015 in amounts equal to the difference between the amounts actually loaned by the Lenders and the aggregate credit commitment. On September 10, 2015, all principal, interest and other amounts outstanding under the Credit Agreement are payable in full. At any time prior to the maturity date, we may repay any amounts owing under all revolving credit loans and all swing line loans in whole or in part, without premium or penalty. Revolving credit loans made under the Credit Agreement bear interest, at our election, at either (i) the base rate (described below) plus 0.25%, (ii) the London Inter-Bank Offered Rate (“LIBOR”) Market Index Rate (as defined in the Credit Agreement) plus 1.25%, or (iii) the LIBOR Rate (as defined in the Credit Agreement) plus 1.25%. Swing line loans bear interest at the LIBOR Market Index Rate plus 1.25%. Interest on each loan featuring the base rate or the LIBOR Market Index Rate is due and payable on the last business day of each calendar month; interest on each loan featuring the LIBOR Rate is due and payable on the last day of each interest period selected by us when selecting the LIBOR Rate as the benchmark for interest calculation. For purposes of the Credit Agreement, the base rate means the highest of (i) the prime rate (as announced by Wells Fargo), (ii) the federal funds rate plus 0.50%, and (iii) LIBOR for an interest period of one month plus 1.0%. The Credit Agreement contains covenants, representations and warranties and other terms, that are customary for revolving credit facilities of this nature. In this regard, the Credit Agreement requires us to maintain a leverage ratio, an EBITDA ratio, and a minimum consolidated net income, and limits the amount of annual capital expenditures we can incur. Additionally, the Credit Agreement contains various negative covenants with which we must comply, including limitations respecting: the incurrence of indebtedness, the creation of liens on our property, mergers or similar combinations or liquidations, asset dispositions, investments in subsidiaries, and other provisions customary in similar types of agreements. As of September 30, 2011, we were in compliance with all financial covenants set forth in the Credit Agreement. As of September 30, 2011, we had outstanding borrowings of approximately $5.6 million under the Credit Agreement, with available borrowings of approximately $119.4 million, based on the leverage ratio in the terms of the Credit Agreement. As of September 30, 2011, our interest rate under the Credit Agreement was a variable rate of 1.62%.

Long-Term Debt. In connection with our acquisition of BioSphere, we entered into the Credit Agreement with the Lenders and Wells Fargo. Pursuant to the terms of the Credit Agreement, the Lenders have agreed to make revolving credit loans up to an aggregate principal amount of $125 million. Wells Fargo has also agreed to make swing line loans from time to time through the maturity date of September 10, 2015 in amounts equal to the difference between the amounts actually loaned by the Lenders and the aggregate credit commitment.

On September 10, 2015, all principal, interest and other amounts outstanding under the Credit Agreement are payable in full. At any time prior to the maturity date, we may repay any amounts owing under all revolving credit loans and all swing line loans in whole or in part, without premium or penalty.

Revolving credit loans made under the Credit Agreement bear interest, at our election, at either (i) the base rate (described below) plus 0.25%, (ii) the London Inter-Bank Offered Rate (“LIBOR”) Market Index Rate (as defined in the Credit Agreement) plus 1.25%, or (iii) the LIBOR Rate (as defined in the Credit Agreement) plus 1.25%. Swing line loans bear interest at the LIBOR Market Index Rate plus 1.25%. Interest on each loan featuring the base rate or the LIBOR Market Index Rate is due and payable on the last business day of each calendar month; interest on each loan featuring the LIBOR Rate is due and payable on the last day of each interest period selected by us when selecting the LIBOR Rate as the benchmark for interest calculation. For purposes of the Credit Agreement, the base rate means the highest of (i) the prime rate (as announced by Wells Fargo), (ii) the federal funds rate plus 0.50%, and (iii) LIBOR for an interest period of one month plus 1.0%.

The Credit Agreement contains covenants, representations and warranties and other terms, that are customary for revolving credit facilities of this nature. In this regard, the Credit Agreement requires us to maintain a leverage ratio, an EBITDA ratio, and a minimum consolidated net income, and limits the amount of annual capital expenditures we can incur. Additionally, the Credit Agreement contains various negative covenants with which we must comply, including limitations respecting: the incurrence of indebtedness, the creation of liens on our property, mergers or similar combinations or liquidations, asset dispositions, investments in subsidiaries, and other provisions customary in similar types of agreements. As of September 30, 2011, we were in compliance with all financial covenants set forth in the Credit Agreement.

As of September 30, 2011, we had outstanding borrowings of approximately $5.6 million under the Credit Agreement, with available borrowings of approximately $119.4 million, based on the leverage ratio in the terms of the Credit Agreement. As of September 30, 2011, our interest rate under the Credit Agreement was a variable rate of 1.62%.