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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)
Assets and liabilities carried at fair value measured on a recurring basis
Trading Securities	$ 10,355	$ 11,062	$ 10,636
Derivative asset	0	0
Derivative liability		0	0
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) | Money Market Funds
Assets and liabilities carried at fair value measured on a recurring basis
Cash and cash equivalents	0	0	0
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) | Time Deposits
Assets and liabilities carried at fair value measured on a recurring basis
Cash and cash equivalents	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)
Assets and liabilities carried at fair value measured on a recurring basis
Trading Securities	87	85	256
Derivative asset	19,443	11,021
Derivative liability		8,344	49,703
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Money Market Funds
Assets and liabilities carried at fair value measured on a recurring basis
Cash and cash equivalents	28,718	101,022	62,657
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Time Deposits
Assets and liabilities carried at fair value measured on a recurring basis
Cash and cash equivalents	3,167	2,238	2,121
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Assets and liabilities carried at fair value measured on a recurring basis
Trading Securities	0	0	0
Derivative asset	0	0
Derivative liability		0	0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Money Market Funds
Assets and liabilities carried at fair value measured on a recurring basis
Cash and cash equivalents	0	0	0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Time Deposits
Assets and liabilities carried at fair value measured on a recurring basis
Cash and cash equivalents	0	0	0
Estimated Fair Value
Assets and liabilities carried at fair value measured on a recurring basis
Trading Securities	10,442	11,147	10,892
Derivative asset	19,443	11,021
Derivative liability		8,344	49,703
Estimated Fair Value | Money Market Funds
Assets and liabilities carried at fair value measured on a recurring basis
Cash and cash equivalents	28,718	101,022	62,657
Estimated Fair Value | Time Deposits
Assets and liabilities carried at fair value measured on a recurring basis
Cash and cash equivalents	$ 3,167	$ 2,238	$ 2,121

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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