Discontinued Operations (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2008 payments	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Discontinued Operations (Textual) [Abstract]
Sale proceeds from disposal of properties	$ 15,000,000	$ 15,000,000	$ 48,800,000
Number of installments in which proceeds from divestiture of businesses to be received (in payments)	3
Amount per installment to be received from divestiture of business	5,000,000
Period after which first installment received	9 months
Period after which second installment received	18 months
Period after which third installment received	30 months
Capitalized cost of assets held for sale		600,000
Gain from discontinued operations, net of taxes			$ 0	$ 14,211,000	$ (181,000)
Income (loss) from discontinued operations, net of taxes (in dollars per share) - Basic			$ 0.00	$ 0.33	$ 0.00
Income (loss) from discontinued operations, net of taxes (in dollars per share)- Diluted			$ 0.00	$ 0.33	$ 0.00