Common Stock Activity (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Class A Common Stock [Member]
Common Stock [Roll Forward]
BALANCE	106,144,075	101,176,247	100,570,418
Option exercises	640,342	543,221	370,715
Restricted Stock issuances, net of cancellations	9,090	4,879	182,537
Stock issuances from exercise of warrants	5,243,167	4,481,656	179,850
Restricted stock unit vesting	104,270	88,330	51,476
Purchase of treasury stock (see Note 9)	(141,257)	(150,258)	(178,749)
BALANCE	111,999,687	106,144,075	101,176,247
Class B Common Stock [Member]
Common Stock [Roll Forward]
BALANCE	0	0	0
Option exercises	0	0	0
Restricted Stock issuances, net of cancellations	0	0	0
Stock issuances from exercise of warrants	0	0	0
Restricted stock unit vesting	0	0	0
Purchase of treasury stock (see Note 9)	0	0	0
BALANCE	0	0	0