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The amount of the cost recognized during the period for defined contribution plans.

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Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

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The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing after the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Commitments and Contingencies (Details) (USD $)	12 Months Ended
Commitments and Contingencies (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies (Textual) [Abstract]
Expense under contribution profit sharing plans	$ 1,100,000	$ 200,000	$ 200,000
Rent expense	24,000,000	13,500,000	9,300,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
YE 2013	22,683,000
YE 2014	21,844,000
YE 2015	20,401,000
YE 2016	15,547,000
YE 2017	13,806,000
Thereafter	27,831,000
Insurance Claims
Commitments and Contingencies (Textual) [Abstract]
Liability and cargo insurance coverage for claims	500,000
Cargo Claims
Commitments and Contingencies (Textual) [Abstract]
Liability and cargo insurance coverage for claims	100,000
Uninsured Risk
Commitments and Contingencies (Textual) [Abstract]
Reserves for estimated uninsured losses	$ 5,000,000	$ 4,300,000