Earnings Per Share (Schedule of Basic and Dilutive Earnings per Share) (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Series A, B and C Common Stock [Member]
Net income per share	$ 0.43	$ 0.41	$ 1.25	$ 1.29
Net income per share	0.43	0.41	1.24	1.28
Series C Convertible Preferred Stock [Member]
Net income per share	0.86	0.82	2.50	2.58
Net income per share	$ 0.86	$ 0.82	$ 2.48	$ 2.56