Changes in AOCI by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (9,648)
Total Other Comprehensive Income	214	$ 175
Ending balance	(9,434)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(11,181)	(11,633)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from AOCL	113	112
Total Other Comprehensive Income	113	112
Ending balance	(11,068)	(11,521)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	120	251
Other comprehensive income before reclassifications	0	0
Amounts reclassified from AOCL	0	0
Total Other Comprehensive Income	0	0
Ending balance	120	251
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,413	1,448
Other comprehensive income before reclassifications	101	63
Amounts reclassified from AOCL	0	0
Total Other Comprehensive Income	101	63
Ending balance	1,514	1,511
Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(9,648)	(9,934)
Other comprehensive income before reclassifications	101	63
Amounts reclassified from AOCL	113	112
Total Other Comprehensive Income	214	175
Ending balance	$ (9,434)	$ (9,759)