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Debt Obligations (Aggregate Scheduled Principal Payments of Debt Obligation, Excluding Amortization of Discounts and Premiums) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of debt repurchases
2013	$ 11,237
2014	250,321
2015	416,568
2016	416,038
2017	330,323
Thereafter	1,047,408
Total principal payments	2,471,895
Net unamortized premiums/(discounts)	(6,565)
Total Debt Obligations	$ 2,465,330	$ 2,393,995

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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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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