Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accrued Liabilities [Abstract]
Accrued insurance costs	$ 125,067	$ 123,447
Accrued compensation	55,354	54,104
Deferred revenue	58,880us-gaap_DeferredRevenue	54,307us-gaap_DeferredRevenue
Taxes other than income	20,632	24,742
Accrued dividends	12,737us-gaap_DividendsPayableCurrent	12,103us-gaap_DividendsPayableCurrent
Deferred rent	9,585us-gaap_DeferredRentCredit	10,424us-gaap_DeferredRentCredit
Deferred compensation	9,653	8,339
Accrued interest payable	5,766	5,609
Accrued other	54,138	34,015
Total accrued liabilities	$ 351,812	$ 327,090

Accrual for taxes other than income taxes current and noncurrent includes payroll taxes.

No definition available.

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- Definition

Accrued compensation excludes payroll taxes.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees.

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities.

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

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- Definition

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy.

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