Accrued Expenses And Other Current Liabilities (Accrued Expenses And Other Current Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts Payable and Accrued Liabilities, Current [Abstract]
Customer deposits and obligations	$ 5,673	$ 16,397
Commissions payable and sales incentive	6,376	10,447
Penalty accruals	4,834	6,002
Warranty reserve	4,559	4,551
Professional fees	2,202	2,540
Taxes other than income tax	1,512	1,956
Special charges	1,618	663	$ 1,645	$ 3,063
Restructuring Reserve, Current	5,097	4,664
Deferred revenue	7,073	118
Accrued Income Taxes, Current	2,560	6,585
Other	10,821	6,203
Accrued expenses and other current liabilities, Total	$ 50,707	$ 59,463