Long-Term Debt	9 Months Ended
Sep. 30, 2014
Long-Term Debt [Abstract]
Debt Obligations	(9) Long-Term Debt Term Loan and Credit Facility The recorded value and fair value of the company's senior secured term loan (the "Term Loan") under its revolving secured credit facility (the "Credit Facility") was $136.9 million and $142.5 million as of September 30, 2014 and December 31, 2013, respectively. The company considers this fair value measure to be a Level 2 measure. The Term Loan matures on December 12, 2017, is secured on the same basis as the Credit Facility and bears interest, at the company's option, at the London Interbank Offered Rate ("LIBOR") plus 1.75% per annum or a base rate plus 0.75% per annum. The company is required to make quarterly principal payments of approximately $1.9 million. The remaining principal amount of $114.4 million will be due at maturity. The Term Loan is otherwise subject to terms and conditions substantially similar to those in the Credit Facility regarding guarantees, covenants and events of default. The Credit Facility provides capacity for up to $300 million of revolving loans and permits the company to utilize up to $125 million of such capacity for the issuance of standby letters of credit. The Credit Facility matures on December 12, 2017. The company's obligations under the Credit Facility are secured by substantially all of the company's assets except for real property. The company has the option to increase the amount of the Credit Facility by up to $150 million, subject to obtaining additional loan commitments and the satisfaction of other specified conditions. Loans under the Credit Facility bear interest at LIBOR plus an applicable margin ranging from 1.75% to 2.50%, with the applicable margin varying according to the company's total leverage ratio, or, at the election of the company, at a base rate plus 0.75% to 1.50%. Letters of credit issued under the Credit Facility accrue fees at a rate equal to the applicable margin for LIBOR loans. In addition, the company is required to pay a quarterly commitment fee for the unused portion of the Credit Facility, if any, at a rate ranging from 0.30% to 0.50%. As of September 30, 2014, there were no revolving loan borrowings under the Credit Facility, although $0.7 million of letters of credit were issued under the Credit Facility. Furthermore, borrowing capacity under the Credit Facility is limited by certain financial covenants, discussed below. Accordingly, as of September 30, 2014, approximately $260 million of the Credit Facility was available for borrowings. Debt Covenants Orbital's Credit Facility contains covenants limiting its ability to, among other things, pay cash dividends, incur debt or liens, redeem or repurchase company stock, enter into transactions with affiliates, make investments, merge or consolidate with others or dispose of assets. In addition, the Credit Facility contains financial covenants with respect to leverage and interest coverage. As of September 30, 2014, the company was in compliance with all of these covenants.

(9) Long-Term Debt

Term Loan and Credit Facility

The recorded value and fair value of the company's senior secured term loan (the "Term Loan") under its revolving secured credit facility (the "Credit Facility") was $136.9 million and $142.5 million as of September 30, 2014 and December 31, 2013, respectively. The company considers this fair value measure to be a Level 2 measure.

The Term Loan matures on December 12, 2017, is secured on the same basis as the Credit Facility and bears interest, at the company's option, at the London Interbank Offered Rate ("LIBOR") plus 1.75% per annum or a base rate plus 0.75% per annum. The company is required to make quarterly principal payments of approximately $1.9 million. The remaining principal amount of $114.4 million will be due at maturity. The Term Loan is otherwise subject to terms and conditions substantially similar to those in the Credit Facility regarding guarantees, covenants and events of default.

The Credit Facility provides capacity for up to $300 million of revolving loans and permits the company to utilize up to $125 million of such capacity for the issuance of standby letters of credit. The Credit Facility matures on December 12, 2017. The company's obligations under the Credit Facility are secured by substantially all of the company's assets except for real property. The company has the option to increase the amount of the Credit Facility by up to $150 million, subject to obtaining additional loan commitments and the satisfaction of other specified conditions. Loans under the Credit Facility bear interest at LIBOR plus an applicable margin ranging from 1.75% to 2.50%, with the applicable margin varying according to the company's total leverage ratio, or, at the election of the company, at a base rate plus 0.75% to 1.50%. Letters of credit issued under the Credit Facility accrue fees at a rate equal to the applicable margin for LIBOR loans. In addition, the company is required to pay a quarterly commitment fee for the unused portion of the Credit Facility, if any, at a rate ranging from 0.30% to 0.50%.

As of September 30, 2014, there were no revolving loan borrowings under the Credit Facility, although $0.7 million of letters of credit were issued under the Credit Facility. Furthermore, borrowing capacity under the Credit Facility is limited by certain financial covenants, discussed below. Accordingly, as of September 30, 2014, approximately $260 million of the Credit Facility was available for borrowings.

Debt Covenants

Orbital's Credit Facility contains covenants limiting its ability to, among other things, pay cash dividends, incur debt or liens, redeem or repurchase company stock, enter into transactions with affiliates, make investments, merge or consolidate with others or dispose of assets. In addition, the Credit Facility contains financial covenants with respect to leverage and interest coverage. As of September 30, 2014, the company was in compliance with all of these covenants.