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Summary of Activity Related To Time-based Restricted Stock Units (RSUs) and Performance-based Restricted Stock Units (PSUs) (Details) - 2015 Plan [Member]	6 Months Ended
	Jun. 30, 2019 $ / shares shares
RSUs
Restricted Stock Units Outstanding
Restricted Stock Units Outstanding, Beginning of year	232,299
Restricted Stock Units Outstanding, Granted	461,606
Restricted Stock Units Outstanding, Vested	(102,218)
Restricted Stock Units Outstanding, Cancelled	(12,827)
Restricted Stock Units Outstanding, End of year	578,860
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value, Beginning of year | $ / shares	$ 29.10
Weighted Average Grant Date Fair Value, Granted | $ / shares	14.06
Weighted Average Grant Date Fair Value, Vested | $ / shares	29.59
Weighted Average Grant Date Fair Value, Cancelled | $ / shares	26.80
Weighted Average Grant Date Fair Value, End of year | $ / shares	$ 17.07
Performance Stock Units (PSUs) [Member]
Restricted Stock Units Outstanding
Restricted Stock Units Outstanding, Beginning of year	171,748	[1]
Restricted Stock Units Outstanding, Granted	204,580	[1]
Restricted Stock Units Outstanding, End of year	376,328	[1]
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value, Beginning of year | $ / shares	$ 28.41
Weighted Average Grant Date Fair Value, Granted | $ / shares	14.13
Weighted Average Grant Date Fair Value, End of year | $ / shares	$ 20.65
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%
[1] The number of shares for 62,791 of the PSUs listed as outstanding at January 1, 2019 represents the actual number of PSUs granted to each recipient eligible to vest if the Company meets its performance goals for the applicable period. The number of shares for the remainder of the PSUs listed as outstanding at January 1, 2019 and for all of the PSUs granted in 2019 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 for those PSUs will vary depending on whether or not the Company meets or exceeds the applicable threshold, target or maximum performance goals for the PSUs, with 200% of the “target” number of PSUs will be eligible to vest at “maximum” performance levels.

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