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Stock Based Compensation (Schedule of Restricted Shares) (Details) - Restricted Stock - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Shares      
Outstanding, beginning balance 1,766 1,498 1,236
Vested (462) (314) (292)
Granted 753 789 822
Forfeited (83) (207) (268)
Outstanding, ending balance 1,974 1,766 1,498
Aggregate Intrinsic Value      
Outstanding, beginning balance $ 35,502 $ 30,631 $ 26,974
Vested (8,139) (6,592) (5,060)
Granted 13,760 15,630 13,016
Forfeited (1,495) (4,167) (4,299)
Outstanding, ending balance $ 39,628 $ 35,502 $ 30,631