Business Segment and Geographic Area Information - Reconciliation of Reportable Segment Profit or Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting [Abstract]
Total Profit or Loss for Reportable Segments	$ 3,973	$ 3,388	$ 7,131	$ 5,843
Corporate Expenses	(1,564)	(1,677)	(3,231)	(3,235)
Income Before Income Taxes	$ 2,409	$ 1,711	$ 3,900	$ 2,608