Accrued Expenses and Other Liabilities Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accrued stock based compensation	$ 14,908	$ 13,458
Accrued compensation	9,238	10,740
Accrued severance	778	304
Accrued and withheld taxes, other than income taxes	4,387	1,674
Accrued Environmental Loss Contingencies, Current	20	1,376
Financing lease obligation	0	1,207
Accrued health benefits	578	614
Accrued profit sharing	916	899
Deferred Revenue	648	693
Other	7,838	9,214
Accrued Liabilities, Current	$ 39,311	$ 40,179