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Equity - AOCI Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Changes in the balances of each component of AOCI        
Balance at the beginning of the period $ 395,331 $ 411,026 $ 374,512 $ 437,775
Total other comprehensive income (loss), net of tax (60) (42) (37) 16
Balance at the end of the period 398,093 402,470 398,093 402,470
Accumulated Other Comprehensive Income        
Changes in the balances of each component of AOCI        
Balance at the beginning of the period 1,917 1,878 1,894 1,820
Total other comprehensive income (loss), net of tax     (37)  
Balance at the end of the period 1,857 $ 1,836 1,857 $ 1,836
Foreign Currency Translation        
Changes in the balances of each component of AOCI        
Balance at the beginning of the period     1,861  
Total other comprehensive income (loss), net of tax     (21)  
Balance at the end of the period 1,840   1,840  
Unrealized Gains (Losses) on Available for Sale Securities        
Changes in the balances of each component of AOCI        
Balance at the beginning of the period     33  
Total other comprehensive income (loss), net of tax     (16)  
Balance at the end of the period $ 17   $ 17