Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Disaggregation of Revenue [Table Text Block]

Our revenue for our PEO HR Outsourcing solutions by geographic region and for our other products and services offerings are as follows:

	Year Ended December 31,
(in thousands)	2018		2017		2016
Northeast	$	996,541	$	854,629	$	750,748
Southeast	447,584		379,874		318,185
Central	637,779		543,486		467,297
Southwest	895,243		767,207		689,334
West	797,942		702,619		664,308
	3,775,089		3,247,815		2,889,872
Other revenue	53,460		52,408		51,475
Total revenue	$	3,828,549	$	3,300,223	$	2,941,347

Property, Plant and Equipment [Table Text Block]

Property and equipment, net consisted of the following:

(in thousands)	December 31, 2018			December 31, 2017
Land	$	6,215		$	6,215
Buildings and improvements	112,308			95,615
Computer hardware and software	115,259			105,060
Software development costs	71,332			60,568
Furniture, fixtures and other	45,694			42,891
	350,808			310,349
Accumulated depreciation and amortization	(233,595		)	(214,690		)
Total property and equipment, net	$	117,213		$	95,659

Estimated Useful Lives of Property and Equipment

The estimated useful lives of property and equipment for purposes of computing depreciation are as follows:

	Useful Life
Buildings and improvements	5-30 years
Computer hardware and software	2-5 years
Software development costs	3-5 years
Furniture, fixtures and other	5-7 years

Activity and Balances Related to Incurred But Not Paid Worker's Compensation Claims

The following table provides the activity and balances related to incurred but not paid workers’ compensation claims:

	Year Ended December 31,
(in thousands)	2018			2017
Beginning balance	$	207,630		$	183,928
Accrued claims	72,066			68,194
Present value discount	(7,829		)	(4,308		)
Paid claims	(42,228		)	(40,184		)
Ending balance	$	229,639		$	207,630
Current portion of accrued claims	$	42,227		$	41,137
Long-term portion of accrued claims	187,412			166,493
Total accrued claims	$	229,639		$	207,630