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Financial Instruments (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Carrying value and estimated fair value of financial instruments |  |
Interest rate swap derivative assets | $ 4,599 | $ 6,212
Restricted investments: |  |
Guaranteed Investment Contract | 5,742 | 5,742
Rabbi Trust | 8,163 | 7,718
Fixed income securities | 1,996 | 2,152
Liabilities: |  |
Interest rate swap derivative liabilities | 490 | 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 | 8,163 | 7,718
Fixed income securities | 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 | 4,599 | 6,212
Restricted investments: |  |
Guaranteed Investment Contract | 5,742 | 5,742
Rabbi Trust | 0 | 0
Fixed income securities | 1,996 | 2,152
Liabilities: |  |
Interest rate swap derivative liabilities | 490 | 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
Fixed income securities | 0 | 0
Liabilities: |  |
Interest rate swap derivative liabilities | $ 0 | $ 0

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