Debt	3 Months Ended
Mar. 31, 2015
Debt Disclosure [Abstract]
Debt	10. Debt The Company had no debt as of March 31, 2015 and December 31, 2014. On August 9, 2012, the Company entered into a Credit Agreement with PNC Bank, National Association, as administrative agent and lender (“PNC Bank”), and the lenders from time to time party thereto, as amended (the “2012 Credit Facility). The 2012 Credit Facility was amended on March 11, 2013, June 20, 2013, September 15, 2014, and March 25, 2015. The 2012 Credit Facility provides for borrowings up to $40,000,000 and under certain conditions maximum borrowings up to $70,000,000. The 2012 Credit Facility includes a sublimit for letters of credit and provides for a separate $10,700,000 letter of credit which expires one year from the date of closing, with annual extensions. The sublimit for letters of credit equals the lesser of (i) an amount equal to $5,000,000 plus the aggregate amount of Designated Usage LC issued and outstanding under the Designated Usage LC sublimit or (ii) $25,000,000. The 2012 Credit Facility expires on August 9, 2016. Borrowings under the 2012 Credit Facility bear interest, at the Company’s option, at the London interbank offering rate (“LIBOR”) plus a margin rate ranging from 1.25% to 2.0%, or the higher of a Base Rate plus a margin rate ranging from 0.25% to 1.0%. The Base Rate is equal to the highest of (i) the Federal Funds Open Rate plus 0.5% and (ii) the Prime Rate and (iii) the Daily Libor Rate plus 1%. The margin rates are based on certain leverage ratios, as defined. The Company is subject to compliance with certain financial covenants set forth in the 2012 Credit Facility, including, but not limited to, indebtedness to EBITDA, as defined, minimum levels of fixed charges and limitations on capital expenditures, as defined. Availability under the 2012 Credit Facility is based upon the Company’s trailing twelve month EBITDA, as defined. The Company’s obligations under the 2012 Credit Facility are secured by the grant of security interests in substantially all of its assets. On May 28, 2013 a letter of credit in the amount of $8,564,000 was issued in favor of the Environmental Protection Agency (“EPA”) to provide financial assurance related to the Company’s annual environmental payments in accordance with the terms of the Consent Decree reached with the United States Department of Justice (“DOJ”) and EPA related to its liability for both OU-1 and OU-2 (see Note 13 for additional information). The letter of credit requires an annual commitment fee of 0.125% and standby commission of 1%, and does not reduce amounts available under the 2012 Credit Facility. As of March 31, 2015, the total liability under the letter of credit equaled $6,423,000. The letter of credit expires on May 28, 2015, and is renewed annually. On March 25, 2015, the Company entered into a Fourth Amendment (the “Fourth Amendment”) to the 2012 Credit Facility. The Fourth Amendment amends the Credit Agreement in order to, among other things: (a) allow for permitted recapitalization distributions, and (b) provide greater flexibility with certain bank covenants, including with regard to EBITDA (as defined) and fixed charges. The Company had no outstanding balance under the 2012 Credit Facility as of March 31, 2015 and December 31, 2014. At March 31, 2015, and December 31, 2014, the Company had total availability under the 2012 Credit Facility of $39,544,000 and $39,527,000, respectively.

10. Debt

The Company had no debt as of March 31, 2015 and December 31, 2014.

On August 9, 2012, the Company entered into a Credit Agreement with PNC Bank, National Association, as administrative agent and lender (“PNC Bank”), and the lenders from time to time party thereto, as amended (the “2012 Credit Facility). The 2012 Credit Facility was amended on March 11, 2013, June 20, 2013, September 15, 2014, and March 25, 2015.

The 2012 Credit Facility provides for borrowings up to $40,000,000 and under certain conditions maximum borrowings up to $70,000,000. The 2012 Credit Facility includes a sublimit for letters of credit and provides for a separate $10,700,000 letter of credit which expires one year from the date of closing, with annual extensions. The sublimit for letters of credit equals the lesser of (i) an amount equal to $5,000,000 plus the aggregate amount of Designated Usage LC issued and outstanding under the Designated Usage LC sublimit or (ii) $25,000,000. The 2012 Credit Facility expires on August 9, 2016.

Borrowings under the 2012 Credit Facility bear interest, at the Company’s option, at the London interbank offering rate (“LIBOR”) plus a margin rate ranging from 1.25% to 2.0%, or the higher of a Base Rate plus a margin rate ranging from 0.25% to 1.0%. The Base Rate is equal to the highest of (i) the Federal Funds Open Rate plus 0.5% and (ii) the Prime Rate and (iii) the Daily Libor Rate plus 1%. The margin rates are based on certain leverage ratios, as defined. The Company is subject to compliance with certain financial covenants set forth in the 2012 Credit Facility, including, but not limited to, indebtedness to EBITDA, as defined, minimum levels of fixed charges and limitations on capital expenditures, as defined. Availability under the 2012 Credit Facility is based upon the Company’s trailing twelve month EBITDA, as defined.

The Company’s obligations under the 2012 Credit Facility are secured by the grant of security interests in substantially all of its assets.

On May 28, 2013 a letter of credit in the amount of $8,564,000 was issued in favor of the Environmental Protection Agency (“EPA”) to provide financial assurance related to the Company’s annual environmental payments in accordance with the terms of the Consent Decree reached with the United States Department of Justice (“DOJ”) and EPA related to its liability for both OU-1 and OU-2 (see Note 13 for additional information). The letter of credit requires an annual commitment fee of 0.125% and standby commission of 1%, and does not reduce amounts available under the 2012 Credit Facility. As of March 31, 2015, the total liability under the letter of credit equaled $6,423,000. The letter of credit expires on May 28, 2015, and is renewed annually.

On March 25, 2015, the Company entered into a Fourth Amendment (the “Fourth Amendment”) to the 2012 Credit Facility. The Fourth Amendment amends the Credit Agreement in order to, among other things: (a) allow for permitted recapitalization distributions, and (b) provide greater flexibility with certain bank covenants, including with regard to EBITDA (as defined) and fixed charges.

The Company had no outstanding balance under the 2012 Credit Facility as of March 31, 2015 and December 31, 2014. At March 31, 2015, and December 31, 2014, the Company had total availability under the 2012 Credit Facility of $39,544,000 and $39,527,000, respectively.