Consolidated Statements of Total Equity (Unaudited) Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Beginning balances (shares) at Sep. 30, 2017		44,803,603
Retirement of treasury shares (shares)		(2,864,667)
Ending balances (shares) at Dec. 31, 2017		41,938,936
Beginning balances at Sep. 30, 2017	$ 631,300	$ 44,800	$ 549,400	$ 80,400	$ (44,500)	$ 1,200
Net income (loss)	(15,600)	0	0	(17,600)	0	2,000
Settlement of equity awards	(12,800)	0	(12,800)	0	0	0
Retirement of treasury shares	0	(2,900)	(35,100)	(6,500)	44,500	0
Stock-based compensation expense	4,500	0	4,500	0	0	0
Distributions to noncontrolling interests	(1,800)	0	0	0	0	(1,800)
Ending balances at Dec. 31, 2017	605,600	$ 41,900	506,000	56,300	0	1,400
Beginning balances (shares) at Sep. 30, 2018		41,939,403
Stock issued under employee incentive plans (shares)		20,463
Ending balances (shares) at Dec. 31, 2018		41,959,866
Beginning balances at Sep. 30, 2018	674,500	$ 41,900	506,300	125,100	0	1,200
Net income (loss)	3,900	0	0	3,300	0	600
Stock issued under employee incentive plans	0	100	(100)	0	0	0
Stock-based compensation expense	100	0	100	0	0	0
Distributions to noncontrolling interests	(500)	0	0	0	0	(500)
Ending balances at Dec. 31, 2018	$ 678,000	$ 42,000	$ 506,300	$ 128,400	$ 0	$ 1,300