Organization and Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accumulated other comprehensive income (loss), interest rate swaps, net of tax	$ (3,500)	$ 3,500
Accumulated other comprehensive income (loss), interest rate swap, tax benefit	(2,200)	(2,200)
Accumulated other comprehensive income (loss) related to foreign currency translation, net of tax	(5,600)	(1,900)
Accumulated other comprehensive income (loss), foreign currency translation, tax benefit	$ (9)	$ 0

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant