Income Taxes - Net Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Accounts receivable	$ 9,348	$ 8,754
State taxes	7,142	5,482
Other liabilities and reserves	27,605	24,947
Other assets	47,887	34,731
Inventory	1,085	1,360
Net operating loss carryforwards	25,339	26,256
Share-based compensation	5,679	5,415
Intangible assets	(223,222)	(201,350)
Property and equipment	(30,744)	(24,419)
Valuation allowance	(12,654)	(12,654)
Total non-current deferred income tax liabilities	$ (142,535)	$ (131,478)