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Equity Incentive Plans - Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Recognized compensation expenses      
Stock option plan expense $ 996 $ 1,305 $ 538
Restricted stock expense $ 21,053 $ 18,539 $ 12,235