Significant Accounting Policies Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Estimate of Fair Value, Fair Value Disclosure [Member]
Bond Portfolio at fair market value	$ 24,865
Interest Rate Swap Agreement Fair Value Liability Disclosure	49,428	35,473
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	74,293	35,473
Fair Value, Inputs, Level 1 [Member]
Bond Portfolio at fair market value	0
Interest Rate Swap Agreement Fair Value Liability Disclosure	0	0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Bond Portfolio at fair market value	24,865
Interest Rate Swap Agreement Fair Value Liability Disclosure	49,428	35,473
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	74,293	35,473
Fair Value, Inputs, Level 3 [Member]
Bond Portfolio at fair market value	0
Interest Rate Swap Agreement Fair Value Liability Disclosure	0	0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	$ 0	$ 0