Long-Term Obligations (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

		2013			2012
Senior term notes	Notes payable, maturing in 2016, secured by assets, variable interest rate (1.92% and 1.96% at 2013 and 2012, respectively)	556,914			592,422
Revolving credit	Revolving line of credit, maturing in 2016, secured by assets, variable interest rate	—			—
Secured seller notes	Notes payable matures in 2014, secured by assets and stock of certain subsidiaries, with interest rate of 10.0%	230			266
	Total debt obligations	557,144			592,688
	Capital lease obligations	62,501			37,955
		619,645			630,643
	Less — current portion	(51,087		)	(39,002		)
		$	568,558		$	591,641

Schedule of Maturities of Long-term Debt [Table Text Block]

	Debt Obligations		Capital Lease Obligations		Total
2014	$	47,574	$	3,515	$	51,089
2015	51,289		3,419		54,708
2016	458,281		3,171		461,452
2017	—		3,490		3,490
2018	—		3,805		3,805
Thereafter	—		45,101		45,101
Total	$	557,144	$	62,501	$	619,645

Summary of Leverage Ratio in effect from time to time

Level	Leverage Ratio	Applicable Margin for Eurodollar Rate Loans		Applicable Revolving Commitment Fee %
I	≥ 2.50:1.00	2.25	%	0.50	%
II	< 2.50:1.00 and ≥ 1.75:1.00	1.75	%	0.375	%
III	< 1.75:1.00 and ≥ 1.00:1.00	1.50	%	0.25	%
IV	< 1.00:1.00	1.25	%	0.20	%

Scheduled principal payments for senior term notes

	2014		2015		2016		2017		2018
Senior term notes	$	47,344	$	51,289	$	458,281	$	—	$	—