Organization and Summary of Significant Accounting Policies Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Redeemable Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interest, beginning of period	$ 2,287	$ 2,665	$ 3,113
Redemption value adjustment of noncontrolling interest	360	0	0
Net loss attributable to noncontrolling interest	(294)	(352)	(51)
Other comprehensive income (loss) attributable to noncontrolling interest	220	(26)	(397)
Less: purchase of redeemable noncontrolling interest	2,573	0	0
Redeemable noncontrolling interest, end of period	$ 0	$ 2,287	$ 2,665