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Accrued Expenses and Other Liabilities Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Accounts Payable and Accrued Liabilities, Current [Abstract] |  |
Accrued stock based compensation | $ 13,458 | $ 8,712
Accrued compensation | 10,740 | 9,044
Accrued severance | 304 | 483
Accrued and withheld taxes, other than income taxes | 1,674 | 1,136
Accrued Environmental Loss Contingencies, Current | 1,376 | 968
Financing lease obligation | 1,207 | 1,123
Accrued health benefits | 614 | 657
Accrued profit sharing | 899 | 894
Deferred Revenue | 693 | 0
Other | 9,214 | 10,023
Accrued Liabilities, Current | $ 40,179 | $ 33,040

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35281-107843 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + Details
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