Pension Plan (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Pension Plan [Abstract]
Highest consecutive years of employee compensation used to compute benefit			3 years
Years of employment used in benefit computation			10 years
Net Pension Cost [Abstract]
Service cost	$ 19,000	$ 68,000	$ 37,000	$ 136,000
Interest cost	133,000	144,000	266,000	296,000
Amortization of prior service cost	22,000	22,000	45,000	44,000
Amortization of actuarial loss	123,000	95,000	245,000	191,000
Net periodic benefit cost	297,000	329,000	593,000	667,000
Unfunded pension plan obligations	$ 16,700,000		$ 16,700,000		$ 16,900,000