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Fair Value (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value
Carrying value	$ 1,530,958,000	$ 1,302,943,000	$ 1,229,498,000
Senior secured credit facility
Fair Value
Carrying value	916,100,000	1,226,600,000	878,000,000
Fair value	907,800,000	1,216,200,000	823,300,000
6.375% Senior Notes
Fair Value
Carrying value	600,000,000
Fair value	$ 570,000,000
Interest rate of debt (as a percent)	6.375%

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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