Commitments and Contingencies and Other Matters (Details 4) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Environmental remediation
Environmental remediation maximum exposure	$ 250,000
Minimum environmental remediation indemnification threshold	250,000
Property and equipment
Minimum lease commitments for property and equipment
2013	3,491,000
2014	2,128,000
2015	1,063,000
2016	588,000
2017	540,000
Thereafter	93,000
Total	7,903,000
Rent expenses charged to operations	$ 3,500,000	$ 2,700,000	$ 1,700,000

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- Definition

Amount of required minimum rental payments for 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 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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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Represents the entity's maximum exposure for environmental remediation.

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Represents the minimum threshold for environmental remediation liability which triggers indemnification by the former owner.

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