Share-Based Compensation to Employees (Restricted Stock Units) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Sep. 30, 2014	Dec. 31, 2014	Sep. 30, 2013	Sep. 30, 2012
Share-based compensation to employees
Shared-based Compensation Arrangement by Shared-based Payment Award, RSUs Terminated			1,000
Stock Issued During Period, Value, Employee Stock Ownership Plan				$ 67
Allocated share-based compensation expense		1,583			8,375	12,628	2,676
Weighted Average Grant Date Fair Value
Shares Paid for Tax Withholding for Share Based Compensation	194
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost			$ 9
RSU [Member]
Units
Outstanding, beginning of period (in shares)		709,000			719,000	630,000	348,000
Granted (in shares)		10,000			151,000	92,000	286,000
Vested (in shares)		0			(680,000)	0	0
Forfeited (in shares)		0			0	(13,000)	(4,000)
Outstanding, end of period (in shares)		719,000			190,000	709,000	630,000
Weighted Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share)		$ 15.50			$ 15.75	$ 13.74	$ 14.20
Granted (in dollars per share)		$ 33.23			$ 23.01	$ 18.85	$ 13.03
Vested (in dollars per share)		$ 0.00			$ 15.26	$ 0.00	$ 0.00
Forfeited (in dollars per share)		$ 0.00			$ 0.00	$ 13.03	$ 13.03
Outstanding, end of period (in dollars per share)		$ 15.75			$ 23.27	$ 15.50	$ 13.74