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Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2012
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On January 29, 2013, the Company announced the pricing of an offering of $500 million aggregate principal amount of 5.375% senior notes due 2021 (the "5.375% Notes). The notes are expected to be issued at par on February 1, 2013 and are senior unsecured obligations of the Company. Interest is payable semi-annually at a rate of 5.375% per annum on February 1 and August 1 of each year, commencing on August 1, 2013. The 5.375% Notes are repayable in whole or in part upon the occurrence of a change of control, at the option of the holders, at a purchase price in cash equal to 101% of the principal plus accrued interest. The Company may redeem the 5.375% Notes prior to maturity in whole or in part at a redemption price of 100% of the principal plus an applicable premium as of, and accrued and unpaid interest, if any, to the applicable redemption date. The 5.375% Notes include, among other terms and conditions, limitations on the Company's ability to create, incur or allow certain liens; enter into sale and lease-back transactions; create, assume, incur or guarantee additional indebtedness of the Company's subsidiaries; and consolidate or merge with, or convey, transfer or lease all or substantially all of the Company's and its subsidiaries assets, to another person.