Changes in AOCI by Component (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (9,648)
Total Other Comprehensive Income	$ 110	$ 156	429	$ 357
Ending balance	(9,219)		(9,219)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(10,955)	(11,408)	(11,181)	(11,633)
Other comprehensive income before reclassifications	0		0	0
Amounts reclassified from AOCL	113	114	339	339
Total Other Comprehensive Income	113	114	339	339
Ending balance	(10,842)	(11,294)	(10,842)	(11,294)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	120	251	120	251
Other comprehensive income before reclassifications	0		0	0
Amounts reclassified from AOCL	0		0	0
Total Other Comprehensive Income	0	0	0	0
Ending balance	120	251	120	251
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,506	1,424	1,413	1,448
Other comprehensive income before reclassifications	(3)	42	90	18
Amounts reclassified from AOCL	0		0	0
Total Other Comprehensive Income	(3)	42	90	18
Ending balance	1,503	1,466	1,503	1,466
Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(9,329)	(9,733)	(9,648)	(9,934)
Other comprehensive income before reclassifications	(3)	42	90	18
Amounts reclassified from AOCL	113	114	339	339
Total Other Comprehensive Income	110	156	429	357
Ending balance	$ (9,219)	$ (9,577)	$ (9,219)	$ (9,577)