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Short-Term and Long-Term Borrowings - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Short-Term Debt	$ 80,997	$ 6,000
Current Maturities of Long-Term Debt	140,087	183
Long-Term Debt, net of current maturities	624,432	689,581
Total	845,516	695,764
OTC
Debt Instrument [Line Items]
Short-Term Debt	65,166	6,000
Current Maturities of Long-Term Debt	169	183
Long-Term Debt, net of current maturities	79,695	79,812
Total	145,030	85,995
OTP
Debt Instrument [Line Items]
Short-Term Debt	15,831	0
Current Maturities of Long-Term Debt	139,918	0
Long-Term Debt, net of current maturities	544,737	609,769
Total	$ 700,486	$ 609,769

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