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Financial Instruments (Details) (Recurring, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Restricted investment:
Guaranteed Investment Contract		$ 5,742
Rabbi Trust	11,044	9,534
Fixed income securities	1,994	1,993
Interest rate cap derivatives assets	1,161
Liabilities:
Interest rate swap derivatives	7,048	390
Quoted Prices in Active Markets (Level 1)
Restricted investment:
Guaranteed Investment Contract		0
Rabbi Trust	0	0
Fixed income securities	0	0
Interest rate cap derivatives assets	0
Liabilities:
Interest rate swap derivatives	0	0
Significant Other Observable Inputs (Level 2)
Restricted investment:
Guaranteed Investment Contract		5,742
Rabbi Trust	11,044	9,534
Fixed income securities	1,994	1,993
Interest rate cap derivatives assets	1,161
Liabilities:
Interest rate swap derivatives	7,048	390
Significant Unobservable Inputs (Level 3)
Restricted investment:
Guaranteed Investment Contract		0
Rabbi Trust	0	0
Fixed income securities	0	0
Interest rate cap derivatives assets	0
Liabilities:
Interest rate swap derivatives	$ 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.

+ References+ Details