Related Parties (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended					1 Months Ended	12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 16, 2010	Sep. 14, 2010	Sep. 30, 2010 Westbury Agreement [Member]	Dec. 31, 2012 Westbury Agreement [Member] Options	Sep. 14, 2010 Westbury Agreement [Member]	Dec. 31, 2012 Director [Member]	Dec. 31, 2011 Director [Member]	Dec. 31, 2010 Director [Member]
Related Parties (Textual) [Abstract]
Common stock repurchased						7,716,669
Common stock repurchase price	$ 0.01	$ 0.01					$ 7.25	$ 6.25
Common stock repurchase value						$ 48.5
Purchase of option								5.0
Date of expiration							Sep. 30, 2013
Shares authorized to be repurchased	1,000,000	1,400,000	1,100,000	4,578,894	7,716,669			7,700,000
Lease Paid by Company	39.2	38.8	39.8						0.7	0.7	0.8
Westbury Agreement, Option exercises by entity							0
Related Parties (Additional Textual) [Abstract]
Legal charges paid	0.2	0.5	0.8
Amount of letter of credit for CPA firm	$ 1.9	$ 5.2