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Derivative Instruments Schedule of Interest Rate Swaps by Maturity (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013
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Derivative [Line Items] |
Derivative, Fair Value, Net | $ 16,114
Interest Rate Swap [Member] |
Derivative [Line Items] |
Derivative notional | 755,900
Derivative, Fair Value, Net | 21,668
Weighted Average Pay Rate | 1.71%
Weighted Average Receive Rate | 0.26%
Weighted Average Years to Maturity | 8 years 289 days
Year 2016 [Member] | Interest Rate Swap [Member] |
Derivative [Line Items] |
Derivative notional | 38,000
Derivative, Fair Value, Net | (204)
Weighted Average Pay Rate | 0.89%
Weighted Average Receive Rate | 0.26%
Weighted Average Years to Maturity | 2 years 322 days
Year 2017 [Member] | Interest Rate Swap [Member] |
Derivative [Line Items] |
Derivative notional | 109,000
Derivative, Fair Value, Net | (696)
Weighted Average Pay Rate | 1.20%
Weighted Average Receive Rate | 0.26%
Weighted Average Years to Maturity | 3 years 300 days
Year 2018 [Member] | Interest Rate Swap [Member] |
Derivative [Line Items] |
Derivative notional | 90,000
Derivative, Fair Value, Net | 1,773
Weighted Average Pay Rate | 0.88%
Weighted Average Receive Rate | 0.27%
Weighted Average Years to Maturity | 4 years 219 days
Year 2020 [Member] | Interest Rate Swap [Member] |
Derivative [Line Items] |
Derivative notional | 235,900
Derivative, Fair Value, Net | 6,054
Weighted Average Pay Rate | 1.57%
Weighted Average Receive Rate | 0.26%
Weighted Average Years to Maturity | 6 years 238 days
Year 2023 [Member] | Interest Rate Swap [Member] |
Derivative [Line Items] |
Derivative notional | 213,000
Derivative, Fair Value, Net | 9,279
Weighted Average Pay Rate | 2.14%
Weighted Average Receive Rate | 0.26%
Weighted Average Years to Maturity | 9 years 238 days
Year 2043 [Member] | Interest Rate Swap [Member] |
Derivative [Line Items] |
Derivative notional | 70,000
Derivative, Fair Value, Net | $ 5,462
Weighted Average Pay Rate | 3.20%
Weighted Average Receive Rate | 0.26%
Weighted Average Years to Maturity | 29 years 249 days

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