Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Gross property and equipment		$ 606,338	$ 544,525
Accumulated depreciation		(300,767)	(264,667)
Property and equipment, net		305,571	279,858
Land and land interests
Property Plant And Equipment [Line Items]
Gross property and equipment	[1]	32,544	31,670
Buildings and leasehold improvements
Property Plant And Equipment [Line Items]
Gross property and equipment		222,118	185,987
Equipment and other
Property Plant And Equipment [Line Items]
Gross property and equipment	[2]	$ 351,676	$ 326,868

[1] Land and land interests include certain leasehold interests in land within Pursuit for which we are considered to have perpetual use rights. The carrying amount of these leasehold interests was $8.4 million as of December 31, 2017 and $7.9 million as of December 31, 2016. These land interests are not subject to amortization.

[2] Equipment and other includes capitalized costs incurred in developing or obtaining internal and external use software. The net carrying amount of capitalized software was $10.1 million as of December 31, 2017 and $11.9 million as of December 31, 2016.