Subsequent Events (Notes)	6 Months Ended
Jun. 30, 2013
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events On July 18, 2013, the Company entered into the Credit Facility, which has a maximum borrowing availability of $200 million. The Credit Facility matures on July 18, 2016. The Credit Facility contains an uncommitted $25 million accordion feature under which its aggregate principal amount can be increased to up to $225 million, subject to certain conditions, including obtaining additional commitments from existing or new lenders, as well as a sub-limit of $100 million for the issuance of letters of credit. Interest on amounts borrowed under the Credit Facility is payable at a rate based on either the Alternate Base Rate plus 2.25% or at the Eurodollar Rate plus 3.25%. Borrowings under the Credit Facility are unsecured and availability is subject to, among other things, a borrowing base. The guarantors as of July 18, 2013 of the Credit Facility are the same subsidiaries that guaranteed the Company's obligations under the Prior Credit Facility. The Credit Facility also contains various representations, warranties and covenants that the Company considers customary for such facilities. Under the terms of the Credit Facility, we are required, among other things, to maintain compliance with various covenants, including financial covenants relating to a minimum consolidated tangible net worth requirement, a minimum interest coverage ratio or liquidity requirement, and a maximum leverage ratio. The Credit Facility replaces the Prior Credit Facility that was scheduled to mature on December 31, 2014. The Company had no borrowings under the Prior Credit Facility at the time it was replaced, and all letters of credit issued and outstanding under the Prior Credit Facility became part of the letter of credit sub-facility under the Credit Facility. The Company incurred no prepayment penalties in connection with the termination and replacement of the Prior Credit Facility. The Company has not made any borrowings under the Credit Facility as of the date of this report.

Subsequent Events

On July 18, 2013, the Company entered into the Credit Facility, which has a maximum borrowing availability of $200 million. The Credit Facility matures on July 18, 2016. The Credit Facility contains an uncommitted $25 million accordion feature under which its aggregate principal amount can be increased to up to $225 million, subject to certain conditions, including obtaining additional commitments from existing or new lenders, as well as a sub-limit of $100 million for the issuance of letters of credit. Interest on amounts borrowed under the Credit Facility is payable at a rate based on either the Alternate Base Rate plus 2.25% or at the Eurodollar Rate plus 3.25%. Borrowings under the Credit Facility are unsecured and availability is subject to, among other things, a borrowing base. The guarantors as of July 18, 2013 of the Credit Facility are the same subsidiaries that guaranteed the Company's obligations under the Prior Credit Facility.

The Credit Facility also contains various representations, warranties and covenants that the Company considers customary for such facilities. Under the terms of the Credit Facility, we are required, among other things, to maintain compliance with various covenants, including financial covenants relating to a minimum consolidated tangible net worth requirement, a minimum interest coverage ratio or liquidity requirement, and a maximum leverage ratio.

The Credit Facility replaces the Prior Credit Facility that was scheduled to mature on December 31, 2014. The Company had no borrowings under the Prior Credit Facility at the time it was replaced, and all letters of credit issued and outstanding under the Prior Credit Facility became part of the letter of credit sub-facility under the Credit Facility. The Company incurred no prepayment penalties in connection with the termination and replacement of the Prior Credit Facility.

The Company has not made any borrowings under the Credit Facility as of the date of this report.