Organization and Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	$ (7,478)	$ (13,024)
Unrealized gains (losses) on interest rate swaps, net of tax (1)	150	(1,054)
Accumulated other comprehensive loss	$ (7,328)	$ (14,078)