Financial Instruments - Fair Value of the Interest Rate Derivative (Details) - Fair Value, Recurring - Interest Rate Swap - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivative Assets
Other current assets	$ 0	$ 216
Other non-current assets	0	0
Total assets at fair value	0	216
Derivative Liability [Abstract]
Other current liabilities	(4,427)	(61)
Other non-current liabilities	(2,629)	(398)
Total liabilities at fair value	(7,056)	(459)
Level 1
Derivative Assets
Other current assets	0	0
Other non-current assets	0	0
Total assets at fair value	0	0
Derivative Liability [Abstract]
Other current liabilities	0	0
Other non-current liabilities	0	0
Total liabilities at fair value	0	0
Level 2
Derivative Assets
Other current assets	0	216
Other non-current assets	0	0
Total assets at fair value	0	216
Derivative Liability [Abstract]
Other current liabilities	(4,427)	(61)
Other non-current liabilities	(2,629)	(398)
Total liabilities at fair value	(7,056)	(459)
Level 3
Derivative Assets
Other current assets	0	0
Other non-current assets	0	0
Total assets at fair value	0	0
Derivative Liability [Abstract]
Other current liabilities	0	0
Other non-current liabilities	0	0
Total liabilities at fair value	$ 0	$ 0

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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