Common Stock and Stock Compensation - Other Disclosures (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Jul. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 25, 2014	Mar. 24, 2014
Restricted Stock [Member] | Executive Chairman [Member]
Class of Stock [Line Items]
Accelerated vesting of restricted stock			270,000
Gross compensation costs			$ 2.2
Restricted Stock [Member] | Executive Chairman [Member] | October 2, 2014 [Member]
Class of Stock [Line Items]
Accelerated vesting of restricted stock			135,000
Restricted Stock [Member] | Executive Chairman [Member] | October 2, 2016 [Member]
Class of Stock [Line Items]
Accelerated vesting of restricted stock			135,000
Common Class A [Member]
Class of Stock [Line Items]
Common Stock, shares authorized				100,000,000	100,000,000	100,000,000	55,550,000
Treasury stock acquired, shares		1,000,000
Treasury stock acquired, value		$ 11.9
Treasury stock retired, shares	1,000,000