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Fair Value Measurements and Derivative Instruments (Unrealized Holding Losses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]    
Greater than 12 continuous months $ 2,369 $ 9,227
Less than 12 continuous months 132,267 52,521
Total 134,636 61,748
Gross unrealized losses    
Greater than 12 continuous months 76 136
Less than 12 continuous months 1,072 583
Total $ 1,148 $ 719
Unrealized loss position, percentage 20.00%