Income and other Taxes (Income Tax Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Federal:
Current									$ 0	$ 0	$ 0
Deferred									0	(1,835)	(21,285)
Federal income tax expense (benefit)									0	(1,835)	(21,285)
State:
Current									(117)	0	0
Deferred									0	(356)	(2,454)
State and local income tax expense (benefit)									(117)	(356)	(2,454)
Foreign:
Current									131	0	0
Deferred									0	0	(811)
Foreign income tax expense (benefit)									131	0	(811)
Income tax expense (benefit)	$ (8)	$ 175	$ (155)	$ 2	$ (339)	$ 456	$ (396)	$ (1,912)	$ 14	$ (2,191)	$ (24,550)