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Financial Instruments (Details) (Recurring, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Restricted investments:
Guaranteed Investment Contract		$ 5,742geo_GuaranteedInvestmentContract
Rabbi Trust	11,281geo_RabbiTrust	9,534geo_RabbiTrust
Fixed income securities	1,966	1,993
Interest rate swap derivative assets	570us-gaap_DerivativeAssets
Liabilities:
Interest rate swap derivative liability	19,248us-gaap_DerivativeLiabilities	390us-gaap_DerivativeLiabilities
Quoted Prices in Active Markets (Level 1)
Restricted investments:
Guaranteed Investment Contract		0
Rabbi Trust	0	0
Fixed income securities	0	0
Interest rate swap derivative assets	0
Liabilities:
Interest rate swap derivative liability	0	0
Significant Other Observable Inputs (Level 2)
Restricted investments:
Guaranteed Investment Contract		5,742
Rabbi Trust	11,281	9,534
Fixed income securities	1,966	1,993
Interest rate swap derivative assets	570
Liabilities:
Interest rate swap derivative liability	19,248	390
Significant Unobservable Inputs (Level 3)
Restricted investments:
Guaranteed Investment Contract		0
Rabbi Trust	0	0
Fixed income securities	0	0
Interest rate swap derivative assets
Liabilities:
Interest rate swap derivative liability	$ 0	$ 0

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.

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- Definition

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 liabilities not subject to a master netting arrangement and not elected to be offset.

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