Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements Recurring (Details)

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Fair Value Measurements Recurring (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets $ 160,682 $ 87,081
Total liabilities 459 3,358
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 158,197 87,081
Total liabilities 0 0
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 2,485 0
Total liabilities 459 3,358
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 0 0
Total liabilities 0 0
US Government Agencies Short-term Debt Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term government securities (cash and cash equivalents) 158,197 87,081
US Government Agencies Short-term Debt Securities | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term government securities (cash and cash equivalents) 158,197 87,081
US Government Agencies Short-term Debt Securities | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term government securities (cash and cash equivalents) 0 0
US Government Agencies Short-term Debt Securities | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term government securities (cash and cash equivalents) 0 0
Interest Rate Swap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps (prepaids and other assets) 2,485  
Interest rate swaps (other liabilities) 459 3,358
Interest Rate Swap [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps (prepaids and other assets) 0  
Interest rate swaps (other liabilities) 0 0
Interest Rate Swap [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps (prepaids and other assets) 2,485  
Interest rate swaps (other liabilities) 459 3,358
Interest Rate Swap [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps (prepaids and other assets) 0  
Interest rate swaps (other liabilities) $ 0 $ 0