Employee Benefit Plans (Details Narrative) (USD $)	12 Months Ended
	Dec. 31, 2012 N	Dec. 31, 2011	Dec. 31, 2010
Accumulated benefit obligation	$ 52,400,000	$ 46,500,000
Increase (decrease) in annual rate per capita cost of covered healthcare benefits, next year	9.00%
Increase (decrease) in annual rate per capita cost of covered healthcare benefits, 2014-2016	1.00%
Increase (decrease) in annual rate per capita cost of covered healthcare benefits, 2017-2018	5.00%
Annual rate of increase in the per capita cost of covered healthcare benefits	5.00%
Description of 401(k)	The Company has a 401(k) defined contribution plan, which covers substantially all employees with more than 1,000 hours of service. Under the terms of the Plan, the Company matches 100% of a participant's contributions, which do not exceed 1% of a participant's compensation, plus 50% of a participant's contributions exceeding 1%, but not more than 6%. The Company's matching contributions were $0.5 million for each of the years ended December 31, 2012, 2011 and 2010. For those employees hired after March 31, 2007 and still actively employed on December 31, 2012, the Company approved and will fund discretionary contribution of $0.2 million, which was based on 5.0% of eligible 2012 compensation. For the years ended December 31, 2011 and 2010, the Company made discretionary contributions of $0.2 million and $0.1 million, respectively, for those qualifying employees.
Number of hours required to participate in contribution plan	1,000
Percent of participants contributions matched by company, below one percent of participants compensation	100.00%
Percent of participants contributions matched by company, above one percent of participants compensation	50.00%
Threshold percentage of participants compensation at which matching decreases	1.00%
Matching contributions, percent	6.00%
Matching contributions	500,000	500,000	500,000
Discretionary contributions, percent	5.00%
Discretionary contributions	200,000	200,000	100,000
Escrow account maintained for 2008 restricted stock plan	100
Maximum number of shares authorized for grant	300
Number of shares authorized for grant, unissued	200
Fair value of vested restricted shares	300,000	200,000	200,000
Pension Benefit Plan
Allocation of plan assets	100.00%	100.00%
Benfit plan, Cash contributions	3,700,000
Other Benefits Plan
Allocation of plan assets	100.00%	100.00%
Benfit plan, Cash contributions	3,900,000
Equity Securities | Pension Benefit Plan
Allocation of plan assets	60.90%	61.60%
Equity Securities | Other Benefits Plan
Allocation of plan assets	40.30%	37.00%
Middlesex | Equity Securities
Allocation of plan assets	2.00%	2.30%
Common stock in plan, value	$ 800,000	$ 700,000