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Debt Obligations and Credit Facilities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Debt Obligations [Abstract]
Debt obligations	$ 626,429	$ 652,143
5.03% [Member]
Debt Obligations [Abstract]
Debt obligations	21,429	32,143
6.09% [Member]
Debt Obligations [Abstract]
Debt obligations	25,500	50,000
5.82% [Member]
Debt Obligations [Abstract]
Debt obligations	50,000	50,000
6.75% [Member]
Debt Obligations [Abstract]
Debt obligations	250,000	250,000
3.19% [Member]
Debt Obligations [Abstract]
Debt obligations	$ 255,000	$ 270,000

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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