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Summary of RSU and PSU Activity (Details) - 2015 Plan [Member]
6 Months Ended
Jun. 30, 2018
$ / shares
shares
RSUs  
Restricted Stock Units Outstanding  
Restricted Stock Units Outstanding, Granted | shares 241,542
Restricted Stock Units Outstanding, Cancelled | shares (5,386)
Restricted Stock Units Outstanding, End of year | shares 236,156
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value, Granted | $ / shares $ 29.09
Weighted Average Grant Date Fair Value, Cancelled | $ / shares 28.72
Weighted Average Grant Date Fair Value, End of year | $ / shares $ 29.10
PSUs  
Restricted Stock Units Outstanding  
Restricted Stock Units Outstanding, Beginning of year | shares 62,791 [1]
Restricted Stock Units Outstanding, Granted | shares 108,957 [1]
Restricted Stock Units Outstanding, End of year | shares 171,748 [1]
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value, Beginning of year | $ / shares $ 27.87
Weighted Average Grant Date Fair Value, Granted | $ / shares 28.72
Weighted Average Grant Date Fair Value, End of year | $ / shares $ 28.41
[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.