Related Party Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
NCC [Member]
Related Party Transaction [Line Items]
Membership interest acquired (in hundredths)	50.00%
Cash contribution for acquisition of membership interest	$ 1,100,000
Office space occupied (in square feet)	50,000
Lease term (in years)	10
Monthly rent expense (per month)	78,056
Rent expense	923,000	835,000	819,000
S and C Development, LLC [Member]
Related Party Transaction [Line Items]
Office space occupied (in square feet)	8,600
Lease term (in years)	7
Monthly rent expense (per month)	5,611
Kenneth St. Romain [Member]
Related Party Transaction [Line Items]
Office space occupied (in square feet)	20,000
Lease term (in years)	5
Monthly rent expense (per month)	9,641
Other Leases [Member]
Related Party Transaction [Line Items]
Rent expense	$ 405,000	$ 469,000	$ 461,000