SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of Depreciation Expense

We recognized the following depreciation expense (in thousands):

2017	$	42,817
2016	36,212
2015	32,412

Property, Plant and Equipment

A summary of our property and equipment as of December 31 is as follows (in thousands):

	Useful Lives (in years)	2017			2016
Furniture, fixtures, and equipment	3 to 12	$	277,014		$	236,180
Buildings	3 to 30	130,712			130,050
Corporate aircraft	10	11,334			11,334
Leasehold improvements	3 to 15	50,616			40,312
Land		23,658			23,635
Construction in progress		4,575			8,534
Less accumulated depreciation		(267,583		)	(217,092		)
Net property and equipment		$	230,326		$	232,953

Schedule of Amortization Expense of Software

We recognized the following amortization expense of purchased and internally developed software (in thousands):

2017	$	13,887
2016	11,404
2015	9,624

Schedule of Other Assets, Noncurrent

A summary of our purchased and internally developed software as of December 31 is as follows (in thousands):

	2017			2016
Purchased software	$	25,805		$	23,753
Internally developed software	55,165			51,507
Less accumulated amortization	(54,194		)	(47,957		)
Net software	$	26,776		$	27,303