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Significant Accounting Policies Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Estimate of Fair Value, Fair Value Disclosure [Member]
Bond Portfolio at fair market value	$ 25,167	$ 25,140
Interest Rate Swap Agreement Fair Value Liability Disclosure	19,766	18,671
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	44,933	43,811
Fair Value, Inputs, Level 1 [Member]
Bond Portfolio at fair market value	0	0
Interest Rate Swap Agreement Fair Value Liability Disclosure	0	0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Bond Portfolio at fair market value	25,167	25,140
Interest Rate Swap Agreement Fair Value Liability Disclosure	19,766	18,671
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	44,933	43,811
Fair Value, Inputs, Level 3 [Member]
Bond Portfolio at fair market value	0	0
Interest Rate Swap Agreement Fair Value Liability Disclosure	0	0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	$ 0	$ 0

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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