Income Taxes Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	December 31,
	2014			2013		2012
Current:
Federal	$	25,490		$	13,457	$	24,434
State	4,405			2,766		4,445
	29,895			16,223		28,879
Deferred:
Federal	(2,438		)	3,777		(2,433		)
State	(656		)	3		(1,312		)
	(3,094		)	3,780		(3,745		)
Total	$	26,801		$	20,003	$	25,134

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	December 31,
	2014		2013		2012
Income tax expense at statutory rate	35.0	%	35.0	%	35.0	%
State income taxes - net of federal benefit	4.0		4.0		3.0
Non-deductible settlement costs	—		5.0		—
Non-deductible expenses	0.6		0.6		0.5
Non-deductible transaction costs	5.2		—		—
Other adjustments	(0.4	)	(0.8	)	(0.6	)
Total income tax provision	44.4	%	43.8	%	37.9	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
	2014			2013
Deferred tax assets (liabilities):
Accrued expenses	$	13,913		$	12,814
Allowance for doubtful accounts	8,324			6,836
Tax credits	3,375			2,898
Captive insurance	10,302			8,979
Total deferred tax assets	35,914			31,527
State taxes	(670		)	(1,111		)
Depreciation and amortization	(6,590		)	(10,825		)
Prepaid expenses	(6,530		)	(5,895		)
Total deferred tax liabilities	(13,790		)	(17,831		)
Net deferred tax assets	$	22,124		$	13,696