Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended		3 Months Ended	12 Months Ended			12 Months Ended										12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2012 Interest rate swap	Dec. 31, 2012 Term Loan	Dec. 31, 2011 Term Loan	Dec. 31, 2011 Prior senior credit facilities Term Loan	Dec. 31, 2010 Prior senior credit facilities Term Loan	Dec. 31, 2012 Senior credit facilities	Dec. 31, 2012 Senior credit facilities Term Loan	Jun. 30, 2011 Senior credit facilities Term Loan	Jun. 30, 2011 Senior credit facilities Term Loan Interest rate swap	Dec. 31, 2012 Senior credit facilities Term Loan Interest rate swap item	Dec. 31, 2011 Senior credit facilities Term Loan Interest rate swap	Jun. 30, 2011 Senior credit facilities Term Loan Minimum Interest rate swap	Dec. 31, 2012 Senior credit facilities Term Loan First option	Dec. 31, 2012 Senior credit facilities Term Loan First option Prime	Dec. 31, 2012 Senior credit facilities Term Loan First option Federal funds	Dec. 31, 2012 Senior credit facilities Term Loan First option One month London Interbank Offered Rate	Dec. 31, 2012 Senior credit facilities Term Loan First option Fixed rate	Dec. 31, 2012 Senior credit facilities Term Loan Second option	Dec. 31, 2012 Senior credit facilities Term Loan Second option London Interbank Offered Rate	Dec. 31, 2012 Senior credit facilities Term Loan Second option Fixed rate	Dec. 31, 2012 Senior credit facilities Revolving credit facility	Nov. 09, 2012 Senior credit facilities Revolving credit facility	Dec. 31, 2012 Senior credit facilities Revolving credit facility Maximum	Dec. 31, 2012 Senior credit facilities Revolving credit facility First option	Dec. 31, 2012 Senior credit facilities Revolving credit facility First option London Interbank Offered Rate	Dec. 31, 2012 Senior credit facilities Revolving credit facility Second option	Dec. 31, 2012 Senior credit facilities Revolving credit facility Second option Prime	Dec. 31, 2012 Senior credit facilities Revolving credit facility Second option Federal funds	Dec. 31, 2012 Senior credit facilities Revolving credit facility Second option One month London Interbank Offered Rate
Long-term debt
Total long-term debt			$ 111,966		$ 111,966	$ 122,937
Less current maturities	11,071		971
Long-term debt, less current maturities	111,866		110,995
Unamortized discount on issuance of debt					946	1,125					1,250
Schedule of maturities on long-term debt
2013			971
2014			971
2015			971
2016			971
2017			971
Thereafter			107,111
Total long-term debt			111,966		111,966	122,937
Long-term debt, additional disclosure
Increase in borrowing ability																									10,000
Borrowings under senior credit facility										125,000														125,000
Amount outstanding					112,000																			80,000
Capitalized deferred financing costs									168
Variable rate basis																	Prime Rate	Federal funds	London Interbank Offered Rate for a one month interest period			London Interbank Offered Rate						London Interbank Offered Rate		Prime Rate	Federal funds	London Interbank Offered Rate for a one month interest period
Interest rate added to variable rate (as a percent)																		0.50%													0.50%	1.00%
Additional fixed interest rate spread (as a percent)																3.25%					4.25%						1.75%		1.25%
Additional interest margin added to fixed and variable rates (as a percent)																				1.00%			1.50%
Fixed interest rate base (as a percent)																				1.50%
Write off of unamortized deferred financing costs	335	2,045					335	995
Write off of unamortized debt discount							338
Loss on extinguishment of debt	673	7,967
Remaining borrowing availability																								60,930
Annual acquisitions allowed																										10,000
Fixed charge coverage ratio to be maintained if certain minimum availability under the credit facility is not maintained.																								1.0
Percentage of net cash proceeds of certain asset sales, certain insurance or condemnation events, requirement for additional principal prepayments										100.00%
Period before end of the fiscal year, for additional principal prepayments of debt, from excess cash flow										150 days
Percentage of excess cash flow paid as additional principal prepayments										50.00%
Reduced percentage of excess cash flow paid as additional principal prepayments upon achievement of certain leverage ratio thresholds, one										25.00%
Reduced percentage of excess cash flow paid as additional principal prepayments upon achievement of certain leverage ratio thresholds, two										0.00%
Length of time after closing date for entering into a hedge												90 days
Percentage of aggregate outstanding principal amount of debt hedged															25.00%
Notional amount			50,000									50,000
Negative fair value included in other long-term liabilities													$ 544	$ 621
Number of financial institutions for which the entity is exposed to counterparty credit risk													1
Fixed interest rate on derivative (as a percent)				6.335%									6.335%
Variable rate basis				LIBOR									LIBOR
Interest rate added to variable rate (as a percent)				4.25%									4.25%
LIBOR floor (as a percent)				1.50%									1.50%