Debt	12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]
Debt	8. Debt *Credit Facility* The Company has an amended and restated senior secured revolving credit facility (the “Credit Facility”) that has a five-year term and provides borrowing capacity of up to $75.0 million, with a $7.5 million sub-limit for the issuance of standby letters of credit. In addition, the Credit Facility provides for a $50.0 million increase in borrowing capacity conditioned on approval by the lending group. The Credit Facility is secured by substantially all of the assets of the Company. During the third quarter of 2013, the Company repaid the $15.0 million then outstanding balance under the Credit Facility. At December 31, 2014 and 2013, there were no amounts outstanding under the Credit Facility. As of December 31, 2014, the Company had the capacity to draw on the entire $75.0 million under the Credit Facility. Amounts outstanding under the Credit Facility bear interest at an annual rate equal to, at the Company’s option, either LIBOR for interest periods of one, two, three or six months or an alternate base rate (as defined in the Credit Facility agreement), plus, in each case, an applicable margin, that ranges from 0.75% to 2.50%. Under the terms of the Credit Facility, the Company is also required to pay certain fees, including an annual commitment fee that ranges from 0.35% to 0.50% on undrawn amounts and a letter of credit participation fee at an annual rate equal to the applicable margin as well as any applicable fronting fees, each of which is payable quarterly in arrears. The Credit Facility contains customary covenants, including covenants that restrict (subject in certain instances to minimum thresholds or exceptions) the ability of the Company and certain of its subsidiaries to incur additional indebtedness, create liens, merge or make acquisitions, dispose of assets, enter into leases, sale/leasebacks or acquisitions of capital stock, and make loans, guarantees and investments, among other things. In addition, the Credit Facility contains certain financial covenants, the most restrictive of which include: (i) a minimum interest coverage ratio (generally, adjusted EBITDA to interest expense as defined in and for the period specified in the Credit Facility agreement) of at least 4.00:1, and (ii) a leverage ratio (generally, total debt as of any date to adjusted EBITDA as defined in and for the period specified in the Credit Facility agreement) of no greater than 2.75:1. For purposes of the Credit Facility, adjusted EBITDA generally means, for any period, net income of the Company before interest expense, income taxes, depreciation and amortization expense, and excluding non-cash stock-based compensation, unrealized mark-to-market gains and losses, certain severance, and certain non-cash non-recurring gains and losses as described in and specified under the Credit Facility. At December 31, 2014 and 2013, the Company was in compliance with all financial covenants under the Credit Facility. The Credit Facility agreement also contains customary provisions regarding events of default which could result in an acceleration of amounts due under the facility. Such events of default include our failure to pay principal or interest when due, our failure to satisfy or comply with covenants, a change of control, the imposition of certain judgments, the invalidation of liens we have granted, and a cross-default to other debt obligations.

8. Debt

Credit Facility

The Company has an amended and restated senior secured revolving credit facility (the “Credit Facility”) that has a five-year term and provides borrowing capacity of up to $75.0 million, with a $7.5 million sub-limit for the issuance of standby letters of credit. In addition, the Credit Facility provides for a $50.0 million increase in borrowing capacity conditioned on approval by the lending group. The Credit Facility is secured by substantially all of the assets of the Company. During the third quarter of 2013, the Company repaid the $15.0 million then outstanding balance under the Credit Facility. At December 31, 2014 and 2013, there were no amounts outstanding under the Credit Facility. As of December 31, 2014, the Company had the capacity to draw on the entire $75.0 million under the Credit Facility.

Amounts outstanding under the Credit Facility bear interest at an annual rate equal to, at the Company’s option, either LIBOR for interest periods of one, two, three or six months or an alternate base rate (as defined in the Credit Facility agreement), plus, in each case, an applicable margin, that ranges from 0.75% to 2.50%. Under the terms of the Credit Facility, the Company is also required to pay certain fees, including an annual commitment fee that ranges from 0.35% to 0.50% on undrawn amounts and a letter of credit participation fee at an annual rate equal to the applicable margin as well as any applicable fronting fees, each of which is payable quarterly in arrears.

The Credit Facility contains customary covenants, including covenants that restrict (subject in certain instances to minimum thresholds or exceptions) the ability of the Company and certain of its subsidiaries to incur additional indebtedness, create liens, merge or make acquisitions, dispose of assets, enter into leases, sale/leasebacks or acquisitions of capital stock, and make loans, guarantees and investments, among other things. In addition, the Credit Facility contains certain financial covenants, the most restrictive of which include: (i) a minimum interest coverage ratio (generally, adjusted EBITDA to interest expense as defined in and for the period specified in the Credit Facility agreement) of at least 4.00:1, and (ii) a leverage ratio (generally, total debt as of any date to adjusted EBITDA as defined in and for the period specified in the Credit Facility agreement) of no greater than 2.75:1. For purposes of the Credit Facility, adjusted EBITDA generally means, for any period, net income of the Company before interest expense, income taxes, depreciation and amortization expense, and excluding non-cash stock-based compensation, unrealized mark-to-market gains and losses, certain severance, and certain non-cash non-recurring gains and losses as described in and specified under the Credit Facility. At December 31, 2014 and 2013, the Company was in compliance with all financial covenants under the Credit Facility.

The Credit Facility agreement also contains customary provisions regarding events of default which could result in an acceleration of amounts due under the facility. Such events of default include our failure to pay principal or interest when due, our failure to satisfy or comply with covenants, a change of control, the imposition of certain judgments, the invalidation of liens we have granted, and a cross-default to other debt obligations.