Equity - Schedule of Shares Issued (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2015
Performance Shares [Member]
Class of Stock [Line Items]
Shares granted (in shares)			642,029
Shares vested measurement period	3 years
Vested in period (in shares)	116,926
Performance Shares [Member] | Index Performance Shares - 1Q [Member]
Class of Stock [Line Items]
Shares granted (in shares)	331,025	106,706
Grant date fair value per share (in dollars per share)	$ 5.81	$ 6.82
Performance Shares [Member] | Peer Performance Shares - 1Q [Member]
Class of Stock [Line Items]
Shares granted (in shares)	331,019	106,705
Grant date fair value per share (in dollars per share)	$ 5.37	$ 6.34
Performance Shares [Member] | Index Performance Shares - 2Q [Member]
Class of Stock [Line Items]
Shares granted (in shares)		163,466
Grant date fair value per share (in dollars per share)		$ 4.05
Performance Shares [Member] | Peer Performance Shares - 2Q [Member]
Class of Stock [Line Items]
Shares granted (in shares)		163,463
Grant date fair value per share (in dollars per share)		$ 4.27
Restricted Stock [Member]
Class of Stock [Line Items]
Shares granted (in shares)	237,570	237,560
Grant date fair value	$ 2,190	$ 2,551
Award requisite service period	3 years