Accrued Liabilities (Loss Reserve Activity) (Details) - Loss Reserve On Contractual Lease Commitments [Member] - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2017	Jun. 30, 2016
Loss reserve on contractual lease commitments, beginning of period	$ 8,395	$ 9,772	$ 2,464	$ 9,242	$ 2,464
Additions	0	0	$ 8,165	0	8,165
Payments	(382)	(168)		(1,229)	(1,025)
Non-cash adjustments	(2,322)	0		(2,322)	0
Loss reserve on contractual lease commitments, end of period	$ 5,691	$ 9,604		$ 5,691	$ 9,604