Fair Value Disclosure (Details) - Fair value measurements, recurring - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Assets:
Assets at fair value	$ 9	$ 0	$ 0
Liabilities:
Liabilities at fair value	1,257	390	326
Prepaid expenses and other current assets
Assets:
Interest rate swap agreements	0	0	0
Foreign currency exchange contracts	9	0	0
Other current liabilities
Liabilities:
Interest rate swap agreements	398	21	4
Foreign currency exchange contracts	31	308	78
Other long-term liabilities
Liabilities:
Interest rate swap agreements	$ 828	$ 61	$ 244