Accounting Policies (Schedule of Inventories) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Raw materials	$ 37,691	$ 27,636
Work in process	58,715	41,823
Finished goods	37,500	36,947
Total inventories	$ 133,906	$ 106,406