Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	6 Months Ended
	Nov. 07, 2016	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Common stock shares authorized		100,000,000	100,000,000	100,000,000
Common stock, par value		$ 0.01	$ 0.01	$ 0.01
Preferred stock shares authorized		50,000,000	50,000,000	50,000,000
Preferred stock, par value		$ 0.01	$ 0.01	$ 0.01
Common stock shares issued		22,648,968	22,648,968	21,620,544
Common stock shares outstanding		22,648,968	22,648,968	21,620,544
Net proceeds from issuances of common stock			$ 24,333
First Amended And Restated 2013 Long-Term Incentive Plan [Member]
Class of Stock [Line Items]
Common stock shares issued related to vesting of restricted stock awards		47,700	200,000
Common stock shares for stock award issuance		1,800,000	1,800,000
2017 Incentive Plan [Member]
Class of Stock [Line Items]
Common stock shares for stock award, available for issuance		1,400,000	1,400,000
Common stock shares rolled into plan		600,000	600,000
Distribution Agreement [Member]
Class of Stock [Line Items]
Aggregate offering price	$ 50,000
Common stock shares sold and issued		400,000	1,200,000
Net proceeds from issuances of common stock		$ 9,600	$ 24,600
Comissions and fees paid to Sales Agents		$ 200	$ 500