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Stock-Based Compensation Plans (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended				3 Months Ended		9 Months Ended
	Aug. 05, 2019	Dec. 31, 2019	Sep. 30, 2019	Jul. 31, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Stock-Based Compensation Plans
Unrecognized compensation cost		$ 2.0				$ 2.0		$ 2.0
Weighted average life over which unrecognized compensation is expected to be recognized								1 year 10 months 28 days
General and administrative expenses
Stock-Based Compensation Plans
Stock-based compensation expense						$ 0.7	$ 1.2	$ 2.8	$ 4.2
Restricted stock awards
Number of Shares
Unvested at the beginning of the period (in shares)								641,013
Granted (in shares)								218,215
Vested (in shares)								(457,524)
Unvested at the end of the period (in shares)		401,704				401,704		401,704
Weighted-Average Grant-Date Fair Value
Unvested at the beginning of the period (in dollars per share)								$ 13.54
Granted (in dollars per share)								8.47
Vested (in dollars per share)								15.23
Unvested at the end of the period (in dollars per share)		$ 8.87				$ 8.87		$ 8.87
Certain officers and employees | Restricted stock awards
Number of Shares
Granted (in shares)	175,200
Certain officers and employees | Restricted stock awards | Vest immediately
Stock-Based Compensation Plans
Vesting (as a percent)	25.00%
Certain officers and employees | Restricted stock awards | Vest one year after grant
Stock-Based Compensation Plans
Vesting (as a percent)	25.00%
Certain officers and employees | Restricted stock awards | Vest two years after grant
Stock-Based Compensation Plans
Vesting (as a percent)	25.00%
Certain officers and employees | Restricted stock awards | Vest three years after grant
Stock-Based Compensation Plans
Vesting (as a percent)	25.00%
Certain officers and employees | Restricted stock units
Number of Shares
Granted (in shares)	22,500
Certain officers and employees | Restricted stock units | Vest one year after grant
Stock-Based Compensation Plans
Vesting (as a percent)	33.30%
Certain officers and employees | Restricted stock units | Vest two years after grant
Stock-Based Compensation Plans
Vesting (as a percent)	33.30%
Certain officers and employees | Restricted stock units | Vest three years after grant
Stock-Based Compensation Plans
Vesting (as a percent)	33.30%
Non-executive director | Restricted stock awards
Number of Shares
Granted (in shares)		4,745	6,470		7,750
Non-employee consultant | Restricted stock awards
Number of Shares
Granted (in shares)				1,550

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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