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Derivative Instrument and Hedging Activity - Accumulated Derivative Instrument Gain (Loss) Activity (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period $ 167,263 $ 168,331
Balance at end of period 170,206 187,925
Accumulated Derivative Instrument Gain    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (179) 900
Net change associated with current period hedging transactions (1,978) (1,165)
Balance at end of period $ (2,157) $ (265)