Long-Term Indebtedness (Details) (USD $)					9 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2012 JPMorgan Chase Bank, N.A. And Wells Fargo Bank, N.A. [Member]	Feb. 24, 2011 JPMorgan Chase Bank, N.A. And Wells Fargo Bank, N.A. [Member]	Sep. 30, 2012 Prudential Investment Management, Inc. [Member]	Feb. 24, 2011 Prudential Investment Management, Inc. [Member]	Sep. 30, 2012 Senior Promissory Notes [Member] Maximum [Member] Prudential Investment Management, Inc. [Member]	Sep. 30, 2012 Prime Rate [Member] JPMorgan Chase Bank, N.A. And Wells Fargo Bank, N.A. [Member]	Sep. 30, 2012 Prime Rate [Member] Maximum [Member] JPMorgan Chase Bank, N.A. And Wells Fargo Bank, N.A. [Member]	Sep. 30, 2012 LIBOR Plus [Member] JPMorgan Chase Bank, N.A. And Wells Fargo Bank, N.A. [Member]	Sep. 30, 2012 LIBOR Plus [Member] Minimum [Member] JPMorgan Chase Bank, N.A. And Wells Fargo Bank, N.A. [Member]	Sep. 30, 2012 LIBOR Plus [Member] Maximum [Member] JPMorgan Chase Bank, N.A. And Wells Fargo Bank, N.A. [Member]
Debt Instrument [Line Items]
Long-term indebtedness			$ 8,075,000
Weighted average interest rate			2.50%
Amount outstanding under line of credit					3,000,000
Senior notes maximum borrowing								150,000,000
Line of credit expiration date					Jan. 01, 2016
Credit expiration date							Feb. 24, 2014
Maximum borrowings under line of credit						50,000,000
Potential Increase In Line Of Credit Borrowing Capacity						20,000,000
Minimum prime interest rate										2.50%
Prime interest rate										0.00%	0.80%	2.00%	2.00%	2.80%
Maturity period of Promissory Notes, in years									12 years
Maximum leverage ratio	2.5
Remaining availability under the facility	196,600,000				47,000,000
Cash and cash equivalents	$ 32,584,000	$ 6,584,000	$ 1,472,000	$ 38,880,000