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Income Taxes (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets    
Deferred compensation and retirement plan $ 15,017 $ 24,715
Accrued expenses not deductible until paid 1,619 3,508
Employee stock-based compensation 1,757 3,321
Accrued payroll not deductible until paid 1,111 1,400
Accounts receivable, net 179 406
Goodwill 700 0
Other, net 290 393
Foreign net operating loss carryforwards 2,887 2,271
State net operating loss carryforwards 3,978 3,349
Foreign tax credit carryforwards 3,653 785
Total gross deferred tax assets 31,191 40,148
Less valuation allowances (28,350) (40,148)
Deferred tax assets, net 2,841 0
Deferred tax liabilities    
Property, plant and equipment (1,941) (3,060)
Goodwill and other intangibles (701) (6,800)
Deferred tax liabilities, other (972) (1,184)
Total gross deferred tax liabilities (3,614) (11,044)
Deferred tax liabilities, Net (773) $ (11,044)
Deferred tax benefit attributable to change in rate $ 3,400