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Stockholders' Equity - Common Stock Purchased Including Purchase of Common Stock for Tax Withholdings (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Equity [Abstract]          
Shares purchased (in shares) 0 401,342 0 131,012 532,354
Amount $ 0 $ 4,749 $ 0 $ 1,806 $ 6,555