Details of Revenues (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 26,285	$ 40,728	$ 68,551	$ 101,348	$ 68,288	$ 78,148	$ 76,420	$ 77,751	$ 236,912	$ 300,607	$ 191,664
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									230,818	300,131	216,741
Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									39,064	39,415	23,741
Columbia Subsidiary
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									3,222	608
Russian Federation
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									14,048	10,758	9,837
United Kingdom
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									2,229	2,021	4,064
Eliminations
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									$ (52,469)	$ (52,326)	$ (62,719)