Revenue Recognition (Impact of New Revenue Guidance on Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Accounts Receivable	$ 81,485	$ 79,120
Inventory	81,996	71,524
Liabilities
Deferred tax liability	48,198	39,269
Stockholders' Equity:
Retained Earnings	136,765	$ 115,737
ASC 2014-09 | Balances without adoption of Topic 606
Assets
Accounts Receivable	78,801
Inventory	84,135
Liabilities
Deferred tax liability	48,056
Stockholders' Equity:
Retained Earnings	136,388
ASC 2014-09 | Effect of Change Higher/(Lower)
Assets
Accounts Receivable	2,684
Inventory	(2,139)
Liabilities
Deferred tax liability	142
Stockholders' Equity:
Retained Earnings	$ 377