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Summary of RSU and PSU Activity (Parenthetical) (Details) - Performance Stock Units (PSUs) [Member] - 2015 Plan [Member]
3 Months Ended
Mar. 31, 2018
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Target number of PSU's eligible to vest at "maximum" performance level 108,957 [1]
Percentage of target number of PSU's eligible to vest at "maximum" performance level 200.00%
[1] The number of Shares listed for PSUs represents the “target” number of PSUs granted to each recipient eligible to vest if the Company meets its “target” performance goals for the applicable period. The actual number of PSUs eligible to vest will vary depending on whether or not the Company meets or exceeds the applicable threshold, target or maximum performance goals for the PSUs. With respect to 108,957 of the listed “target” number of PSUs, 200% of the “target” number of PSUs will be eligible to vest at “maximum” performance levels.