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Liabilities Subordinated to Claims of General Creditors (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Partnership's liabilities subordinated to claims of general creditors
Total subordinated debt	$ 100,000	$ 150,000
7.33% capital notes [Member]
Partnership's liabilities subordinated to claims of general creditors
Total subordinated debt	$ 100,000	$ 150,000

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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