Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Schedule of Property and equipment

Property and equipment, net consisted of the following:

	As of December 31,
	2017			2016
	(in thousands)
Buildings	$	634,061		$	548,232
Furniture and equipment	256,509			236,634
Software	151,890			134,321
Leasehold improvements	117,806			108,702
Computers	61,294			58,271
Total property and equipment, gross	1,221,560			1,086,160
Less: accumulated depreciation	(432,123		)	(387,798		)
Total property and equipment, net	$	789,437		$	698,362