Subsequent Events	6 Months Ended
Jun. 30, 2012
Subsequent Events	15. Subsequent Events On July 17, 2012, the Company issued $250,000 aggregate principal amount of the 2022 Notes. On July 30, 2012, the Company voluntarily redeemed all $250,000 aggregate principal amount of the 2016 Notes at a redemption price of 102.208% of the principal amount, plus accrued and unpaid interest to the redemption date. The Company used the net proceeds from the issuance of the 2022 Notes, plus cash on hand, to pay the redemption price of the 2016 Notes. As a result of the early redemption of the 2016 Notes, the Company expects to recognize $6,797 in non-operating expense in the third quarter of 2012 consisting of a pre-payment premium of $5,520 and a write-off of $1,277 in previously capitalized debt issuance costs. The Treasury lock agreements executed by the Company to fix the Treasury yield component of the interest cost of financing the anticipated issuance of senior notes were settled in July 2012, subsequent to the issuance of the 2022 Notes. The Treasury locks were settled with an aggregate payment of $1,940 to the counterparties due to a decrease in the 10-year Treasury rates between inception and settlement of the Treasury lock agreements. Subsequent events were evaluated through the date on which the financial statements were issued.

Subsequent Events

6 Months Ended

Jun. 30, 2012

15. Subsequent Events

On July 17, 2012, the Company issued $250,000 aggregate principal amount of the 2022 Notes. On July 30, 2012, the Company voluntarily redeemed all $250,000 aggregate principal amount of the 2016 Notes at a redemption price of 102.208% of the principal amount, plus accrued and unpaid interest to the redemption date. The Company used the net proceeds from the issuance of the 2022 Notes, plus cash on hand, to pay the redemption price of the 2016 Notes. As a result of the early redemption of the 2016 Notes, the Company expects to recognize $6,797 in non-operating expense in the third quarter of 2012 consisting of a pre-payment premium of $5,520 and a write-off of $1,277 in previously capitalized debt issuance costs.

The Treasury lock agreements executed by the Company to fix the Treasury yield component of the interest cost of financing the anticipated issuance of senior notes were settled in July 2012, subsequent to the issuance of the 2022 Notes. The Treasury locks were settled with an aggregate payment of $1,940 to the counterparties due to a decrease in the 10-year Treasury rates between inception and settlement of the Treasury lock agreements.

Subsequent events were evaluated through the date on which the financial statements were issued.