SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of Estimated Useful Lives of Property and Equipment

Property and equipment, including significant improvements, are recorded at cost. Repairs and maintenance costs are expensed as incurred. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, or, in the case of leasehold improvements, the lease term, if shorter.

Asset Category	Estimated Useful Lives
Computer equipment and capitalized software	2 to 3 Years
Furniture and other equipment	5 to 7 Years
Buildings and leasehold improvements	5 to 25 Years

	December 31,
	2017			2016
	(In thousands)
Property and equipment, net of accumulated depreciation and amortization:
Computer equipment and capitalized software	$	41,853		$	27,309
Buildings and leasehold improvements	13,984			6,075
Furniture and other equipment	6,222			3,140
Projects in progress	12,801			5,198
Land	2,800			—
	77,660			41,722
Accumulated depreciation and amortization	(24,368		)	(18,077		)
Property and equipment, net of accumulated depreciation and amortization	$	53,292		$	23,645