Derivatives - Effect of Derivative Instruments on Balance Sheets (Details) - Interest Rate Swaps - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivatives
Derivative liabilities	$ 2,581	$ 6,337
Derivatives Designated as Hedging Instruments
Derivatives
Derivative liabilities	1,502	6,337
Derivatives Designated as Hedging Instruments | Accrued liabilities
Derivatives
Derivative liabilities	1,502	4,810
Derivatives Designated as Hedging Instruments | Other liabilities
Derivatives
Derivative liabilities		$ 1,527
Derivatives Not Designated as Hedging Instruments | Accrued liabilities
Derivatives
Derivative liabilities	$ 1,079