Litigation (Details) - USD ($)	Oct. 26, 2015	Sep. 30, 2015	Mar. 31, 2015	May. 31, 2011
Business Acquisition [Line Items]
Recorded amount of accruals for litigation settlement net of insurance recovery		$ 16,948,000	$ 10,096,000
M&T Bank and Trustee [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Amount of litigation settlement	$ 18,500,000
Amount of litigation settlement paid by Company insurers	$ 9,250,000
Recorded amount of accruals for litigation settlement net of insurance recovery		$ 9,250,000
Fapco [Member]
Business Acquisition [Line Items]
Direct ownership interest acquired				1.00%
FAPL's ownership interest prior to acquisition				99.00%
Combined direct and indirect ownership interest subsequent to acquisition				100.00%