Income and other Taxes (Income Tax Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Federal:
Current									$ 135	$ 0	$ 0
Deferred									0	0	(1,835)
Federal income tax expense (benefit)									135	0	(1,835)
State:
Current									28	(117)	0
Deferred									0	0	(356)
State and local income tax expense (benefit)									28	(117)	(356)
Foreign:
Current									0	131	0
Deferred									0	0	0
Foreign income tax expense (benefit)									0	131	0
Income tax expense (benefit)	$ 32	$ 19	$ (8)	$ 120	$ (8)	$ 175	$ (155)	$ 2	$ 163	$ 14	$ (2,191)	$ (24,600)