Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic computation	50,569,725	50,440,685	50,538,260	50,410,928
Performance share awards (1)	69,280	334,467	75,159	333,213
Diluted computation	50,639,005	50,775,152	50,613,419	50,744,141