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Financial Instruments (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Restricted investments:
Guaranteed Investment Contract	$ 5,742	$ 5,742
Rabbi Trust	11,066	9,534
Fixed income securities	2,076	1,993
Liabilities:
Interest rate swap derivative liabilities	361	390
Quoted Prices in Active Markets (Level 1)
Restricted investments:
Guaranteed Investment Contract	0	0
Rabbi Trust	0	0
Fixed income securities	0	0
Liabilities:
Interest rate swap derivative liabilities	0	0
Significant Other Observable Inputs (Level 2)
Restricted investments:
Guaranteed Investment Contract	5,742	5,742
Rabbi Trust	11,066	9,534
Fixed income securities	2,076	1,993
Liabilities:
Interest rate swap derivative liabilities	361	390
Significant Unobservable Inputs (Level 3)
Restricted investments:
Guaranteed Investment Contract	0	0
Rabbi Trust	0	0
Fixed income securities	0	0
Liabilities:
Interest rate swap derivative liabilities	$ 0	$ 0

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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