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Property and Equipment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property and Equipment [Abstract]
Property and equipment		$ 750,826	$ 678,457
Less: accumulated depreciation		(286,239)	(233,725)
Property and equipment, net		464,587	444,732	$ 454,537
Depreciation expense		58,300	60,800	$ 61,600
Land [Member]
Property and Equipment [Abstract]
Property and equipment		33,667	33,158
Buildings [Member]
Property and Equipment [Abstract]
Property and equipment		274,632	266,436
Construction in Progress [Member]
Property and Equipment [Abstract]
Property and equipment	[1]	53,125	31,124
Furniture and Fixtures [Member]
Property and Equipment [Abstract]
Property and equipment		95,378	82,194
Computers and Equipment [Member]
Property and Equipment [Abstract]
Property and equipment		156,994	143,014
Leasehold Improvements [Member]
Property and Equipment [Abstract]
Property and equipment		123,479	109,863
Scanners [Member]
Property and Equipment [Abstract]
Property and equipment		11,212	10,578
Vehicles [Member]
Property and Equipment [Abstract]
Property and equipment		2,339	2,090
Internal-Use Software Development Costs [Member]
Property and Equipment [Abstract]
Property and equipment		$ 43,400	$ 25,800
[1] Construction in progress includes $25.8 million and $[___] million as of December 31, 2016 and 2017, respectively, of eligible capitalized internal-use software development costs which will be reclassified to computers and equipment when placed into service.

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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+ References

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