Debt	6 Months Ended
Jun. 30, 2015
Debt [Abstract]
Debt	(7)Debt Credit Facility The Company has a $1.0 billion bank credit facility, comprised of a $600 million revolving credit facility and a $400 million term loan. The principal balance of the term loan is payable in installments of $5.0 million on the last day of each fiscal quarter, which began on June 30, 2012. As of June 30, 2015, the Company had $335 million outstanding under the term loan and had no amounts outstanding under the revolving portion of its credit facility. The Company also had approximately $43.2 million of letters of credit outstanding that reduce the Company’s borrowing availability under the revolving portion of the credit facility. Any amounts outstanding under the bank credit facility are due on February 7, 2017. Amounts borrowed under the credit facility bear interest at LIBOR plus margins that depend on the Company’s credit rating. Senior Unsecured Notes The Company has outstanding $500 million of 6 3/8% unsecured senior notes due 2019. The indenture governing the 6 3/8% senior notes requires semi-annual interest payments on May 1 and November 1 of each year through the maturity date of May 1, 2019. The Company also has outstanding $800 million of 7 1/8% unsecured senior notes due 2021. The indenture governing the 7 1/8% senior notes requires semi-annual interest payments on June 15 and December 15 of each year through the maturity date of December 15, 2021.

Debt

6 Months Ended

Jun. 30, 2015

(7)Debt

Credit Facility

The Company has a $1.0 billion bank credit facility, comprised of a $600 million revolving credit facility and a $400 million term loan. The principal balance of the term loan is payable in installments of $5.0 million on the last day of each fiscal quarter, which began on June 30, 2012. As of June 30, 2015, the Company had $335 million outstanding under the term loan and had no amounts outstanding under the revolving portion of its credit facility. The Company also had approximately $43.2 million of letters of credit outstanding that reduce the Company’s borrowing availability under the revolving portion of the credit facility.

Any amounts outstanding under the bank credit facility are due on February 7, 2017. Amounts borrowed under the credit facility bear interest at LIBOR plus margins that depend on the Company’s credit rating.

Senior Unsecured Notes

The Company has outstanding $500 million of 6 3/8% unsecured senior notes due 2019. The indenture governing the 6 3/8% senior notes requires semi-annual interest payments on May 1 and November 1 of each year through the maturity date of May 1, 2019.

The Company also has outstanding $800 million of 7 1/8% unsecured senior notes due 2021. The indenture governing the 7 1/8% senior notes requires semi-annual interest payments on June 15 and December 15 of each year through the maturity date of December 15, 2021.