Long-Term Indebtedness (Details) (USD $)									3 Months Ended				3 Months Ended	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 Line of Credit	Feb. 24, 2014 Line of Credit	Dec. 31, 2013 Line of Credit	Sep. 30, 2013 Line of Credit	Sep. 30, 2014 Line of Credit Minimum	Sep. 30, 2014 JPMorgan Chase Bank And Wells Fargo Bank Line of Credit	Feb. 24, 2014 JPMorgan Chase Bank And Wells Fargo Bank Line of Credit	Feb. 24, 2011 JPMorgan Chase Bank And Wells Fargo Bank Line of Credit	Sep. 30, 2014 JPMorgan Chase Bank And Wells Fargo Bank Line of Credit Prime Rate	Sep. 30, 2014 JPMorgan Chase Bank And Wells Fargo Bank Line of Credit Prime Rate	Sep. 30, 2014 JPMorgan Chase Bank And Wells Fargo Bank Line of Credit Prime Rate Minimum	Sep. 30, 2014 JPMorgan Chase Bank And Wells Fargo Bank Line of Credit Prime Rate Maximum	Sep. 30, 2014 JPMorgan Chase Bank And Wells Fargo Bank Line of Credit LIBOR Plus	Sep. 30, 2014 JPMorgan Chase Bank And Wells Fargo Bank Line of Credit LIBOR Plus Minimum	Sep. 30, 2014 JPMorgan Chase Bank And Wells Fargo Bank Line of Credit LIBOR Plus Maximum	Sep. 30, 2014 Prudential Investment Management Inc Line of Credit	Sep. 30, 2014 Prudential Investment Management Inc Line of Credit Maximum
Line of Credit Facility
Line of Credit Facility, Amount Outstanding					$ 40,000,000		$ 0	$ 0												$ 0
Debt Instrument, Interest Rate During Period									1.90%
Maximum borrowings under line of credit						50,000,000					75,000,000
Potential increase in line of credit borrowing capacity												25,000,000
Interest rate														1.00%	0.75%	1.00%	1.75%	1.75%	2.00%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum													1.50%
Letter of credit										2,000,000
Remaining availability under the facilities					183,000,000					33,000,000										150,000,000
Maturity period of Promissory Notes																					12 years
Period after request is issued, by company, for interest payable rate to be determined by Prudential																				5 days
Maximum leverage ratio					2.5
Cash and cash equivalents	$ 4,000	$ 66,280,000	$ 52,873,000	$ 9,939,000