Discontinued Operations - EPS (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity in earnings of unconsolidated affiliates, net of tax	$ 0	$ 7,300,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	882	125,000
Incremental Dilutive Effect per Share of Share-based Payment Arrangements	$ 0.01
Income (Loss) Allocated to Participating Unvested Restricted Common Shares	$ 100,000	$ 100,000
Net Income (Loss) Available to Common Stockholders, Basic	$ 13,000,000	$ 84,300,000
Total average common shares outstanding during the period	5,539,600	5,978,400
Average unvested restricted common shares	(54,000)	(58,800)
Basic earnings per share denominator	5,485,600	5,919,600
Average outstanding dilutive options to acquire common shares	5,540,500	5,978,400
Diluted earnings (loss) per share denominator	5,486,500	5,919,600
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements			125,000
Net loss from discontinued operations, net of tax	$ (900,000)	$ 73,800,000
Income (Loss) Allocated to Participating Unvested Restricted Common Shares	0	700,000
Net Income (Loss) Available to Common Stockholders, Basic	$ (900,000)	$ 73,100,000
Total average common shares outstanding during the period	5,540,500	5,978,400
Average unvested restricted common shares	(54,000)	(58,800)
Basic earnings per share denominator	5,485,600	5,919,600
Average outstanding dilutive options to acquire common shares	0	0
Diluted earnings (loss) per share denominator	5,486,500	5,919,600
Earnings Per Share, Basic and Diluted	$ (0.17)	$ 12.33
Common Stock [Member] | Symetra
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity in earnings of unconsolidated affiliates, net of tax		$ 7,200,000
Amortization of common share basis difference | Common Stock [Member] | Symetra
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity in earnings of unconsolidated affiliates, net of tax	$ 2,015	$ 700,000
Employee Stock Option [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	125,000