Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 2,791,000	$ 2,589,000	$ 2,414,000	$ 2,645,000
Unrealized Loss on Foreign Currency Derivatives, before Tax	642,000	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Before Tax	(67,000)	(80,000)
Unrealized Foreign Currency Hedge Gain (Loss), Tax	(225,000)	0
Other Comprehensive Income (Loss), Tax	(198,000)	24,000
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	2,554,000	2,589,000	2,614,000	2,645,000
Unrealized Loss on Foreign Currency Derivatives, before Tax	0	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Before Tax	(87,000)	(80,000)
Other Comprehensive Income (Loss), Tax	27,000	24,000
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	237,000	0	$ (200,000)	$ 0
Unrealized Loss on Foreign Currency Derivatives, before Tax	642,000	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	20,000	0
Unrealized Foreign Currency Hedge Gain (Loss), Tax	$ (225,000)
Other Comprehensive Income (Loss), Tax		$ 0