Savings and Retirement Plans (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Savings and Retirement Plans [Abstract]
Employer discretionary contribution amount to U.S. plan			$ 305,000	$ 162,000
Defined Benefit Plans, Net Periodic Retirement Cost [Abstract]
Gross service cost	$ 28,000	$ 36,000	56,000	65,000
Interest cost	29,000	24,000	58,000	53,000
Expected return on assets	(24,000)	(19,000)	(49,000)	(39,000)
Amortization	(1,000)	7,000	(3,000)	7,000
Net periodic retirement cost	$ 32,000	$ 48,000	$ 62,000	$ 86,000