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Equity Compensation Plans - Restricted Stock and RSUs (Details) - Restricted Stock and Restricted Stock Units [Member] - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Changes in unvested awards
Nonvested at the beginning of the period (in shares)	552,281
Granted (in shares)	166,106	254,281
Vested (in shares)	(123,937)
Nonvested at the end of the period (in shares)	594,450
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 11.30
Granted (in dollars per share)	12.77
Vested (in dollars per share)	7.43
Nonvested at the end of the period (in dollars per share)	$ 12.52
Additional information
Total unrecognized compensation cost of restricted awards	$ 3.6
Expected weighted-average period for recognition of unrecognized compensation	1 year 11 months 19 days

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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