Stockholders' Equity (Details 2) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Accumulated other comprehensive loss
Net actuarial loss and prior service cost not yet recognized in net periodic benefit cost, net of income tax benefit	$ (3,220,000)	$ (3,265,000)
Accumulated unrealized gain on available-for-sale securities, net of income tax expense	24,000	17,000
Accumulated other comprehensive loss	(3,196,000)	(3,248,000)
Income tax benefit of net actuarial loss and prior service cost not yet recognized in net periodic benefit cost	2,155,000	2,185,000
Income tax benefit of accumulated unrealized gain on available-for-sale securities	$ 17,000	$ 12,000