Summary of Activity Related To Time-based Restricted Stock Units (RSUs) and Performance-based Restricted Stock Units (PSUs) (Parenthetical) (Details) - Performance Stock Units (PSUs) [Member] - 2015 Plan [Member]	6 Months Ended
	Jun. 30, 2020 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Actual number of PSUs granted to each recipient, eligible to vest	62,791
Percentage of target number of PSU's eligible to vest at "maximum" performance level	200.00%