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Financial Instruments (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Carrying value and estimated fair value of financial instruments |  |
Interest rate swap derivative assets | $ 4,045 | $ 6,212
Restricted investments: |  |
Guaranteed Investment Contract | 5,742 | 5,742
Rabbi Trust | 8,772 | 7,718
Held-to-maturity Securities, Fair Value | 2,042 | 2,152
Liabilities: |  |
Interest rate swap derivative liabilities | 495 | 708
Quoted Prices in Active Markets (Level 1) |  |
Carrying value and estimated fair value of financial instruments |  |
Interest rate swap derivative assets | 0 | 0
Restricted investments: |  |
Guaranteed Investment Contract | 0 | 0
Rabbi Trust | 8,772 | 7,718
Held-to-maturity Securities, Fair Value | 0 | 0
Liabilities: |  |
Interest rate swap derivative liabilities | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Carrying value and estimated fair value of financial instruments |  |
Interest rate swap derivative assets | 4,045 | 6,212
Restricted investments: |  |
Guaranteed Investment Contract | 5,742 | 5,742
Rabbi Trust | 0 | 0
Held-to-maturity Securities, Fair Value | 2,042 | 2,152
Liabilities: |  |
Interest rate swap derivative liabilities | 495 | 708
Significant Unobservable Inputs (Level 3) |  |
Carrying value and estimated fair value of financial instruments |  |
Interest rate swap derivative assets | 0 | 0
Restricted investments: |  |
Guaranteed Investment Contract | 0 | 0
Rabbi Trust | 0 | 0
Held-to-maturity Securities, Fair Value | 0 | 0
Liabilities: |  |
Interest rate swap derivative liabilities | $ 0 | $ 0

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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