Long-Term Debt (Details Textual) (USD $)	9 Months Ended		9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended			9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013	May 31, 2013	Sep. 30, 2013 Maximum [Member]	Dec. 31, 2012 Maximum [Member]	Sep. 30, 2013 Maximum [Member] Base Rate [Member]	Dec. 31, 2012 Maximum [Member] Base Rate [Member]	Sep. 30, 2013 Minimum [Member]	Dec. 31, 2012 Minimum [Member]	Sep. 30, 2013 Minimum [Member] Base Rate [Member]	Dec. 31, 2012 Minimum [Member] Base Rate [Member]	Sep. 30, 2013 LIBOR Rate	Dec. 31, 2012 LIBOR Rate	Sep. 30, 2013 LIBOR Rate Maximum [Member]	Dec. 31, 2012 LIBOR Rate Maximum [Member]	Sep. 30, 2013 LIBOR Rate Minimum [Member]	Dec. 31, 2012 LIBOR Rate Minimum [Member]	Sep. 30, 2013 Term loan [Member]	Sep. 30, 2013 Revolving credit facility [Member]
Debt Instrument [Line Items]
Credit Facility maximum borrowing capacity	$ 120,000,000																$ 30,000,000	$ 90,000,000
Term loan principal amortization rate																	5.00%
Amortization payment	0
Credit facility matures	May 31, 2018
Unused borrowing capacity under the revolving credit Facility																		70,000,000
Consolidated leverage ratio			2.50%				1.00%
Debt Instrument, Interest Rate, Effective Percentage											0.17905%	0.2117%
Debt Instrument, Basis Spread on Variable Rate					1.25%	1.75%			0.25%	0.50%			2.25%	2.75%	1.25%	1.50%
Line of Credit Facility, Commitment Fee Percentage			0.35%	0.375%			0.25%	0.25%
Additional Business Acquisitions Cost	35,000,000
Excluded distributions under Credit Facility		$ 20,000,000