Common Stock, Options, and Stock Compensation (Details Textuals 2) - USD ($)	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2014	Sep. 30, 2014	Mar. 25, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
Class of Stock [Line Items]
Treasury stock acquired				$ 11,900,000	$ 11,903,000
Treasury stock retired					0
Treasury stock value		$ 11,901,000		$ 11,901,000	$ 0
Common Class A [Member]
Class of Stock [Line Items]
Common Stock, shares authorized		100,000,000	100,000,000	100,000,000	100,000,000	100,000,000	56,000,000	55,550,000	54,000,000	54,000,000	56,000,000	56,000,000
Treasury stock acquired, shares		1,000,000
Treasury stock acquired		$ 11,900,000
Treasury stock retired	$ 1,000,000
Executive Chairman [Member] | Restricted Stock [Member]
Class of Stock [Line Items]
Accelerated vesting of restricted stock			270,000
Gross compensation costs			$ 2,200,000
October 2, 2014 [Member] | Executive Chairman [Member] | Restricted Stock [Member]
Class of Stock [Line Items]
Accelerated vesting of restricted stock			135,000
October 2, 2016 [Member] | Executive Chairman [Member] | Restricted Stock [Member]
Class of Stock [Line Items]
Accelerated vesting of restricted stock			135,000