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Financial Instruments (Details) (Recurring, USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets:
Interest rate swap derivative assets		$ 6,212
Restricted investments:
Guaranteed Investment Contract	5,742	5,742
Rabbi Trust	9,534	7,718
Fixed income securities	1,993	2,152
Liabilities:
Interest rate swap derivative liability	390	708
Quoted Prices in Active Markets (Level 1)
Assets:
Interest rate swap derivative assets		0
Restricted investments:
Guaranteed Investment Contract	0	0
Rabbi Trust	0	0
Fixed income securities	0	0
Liabilities:
Interest rate swap derivative liability	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Interest rate swap derivative assets		6,212
Restricted investments:
Guaranteed Investment Contract	5,742	5,742
Rabbi Trust	9,534	7,718
Fixed income securities	1,993	2,152
Liabilities:
Interest rate swap derivative liability	390	708
Significant Unobservable Inputs (Level 3)
Assets:
Interest rate swap derivative assets		0
Restricted investments:
Guaranteed Investment Contract	0	0
Rabbi Trust	0	0
Fixed income securities	0	0
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 assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details