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Organization and Summary of Significant Accounting Policies - Intangibles (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Identifiable intangible assets, net      
Accumulated amortization $ 24,400,000   $ 23,500,000
Net Balance 70,841,000   71,680,000
Amortization (839,000)    
Impairment of intangible assets 0 $ 0  
Goodwill $ 35,866,000   35,866,000
Minimum      
Identifiable intangible assets, net      
Finite-Lived Intangible Asset, Useful Life 20 years    
Maximum      
Identifiable intangible assets, net      
Finite-Lived Intangible Asset, Useful Life 30 years    
Customer Relationships      
Identifiable intangible assets, net      
Net Balance $ 59,765,000   60,448,000
Amortization (683,000)    
Trade Names      
Identifiable intangible assets, net      
Net Balance 11,076,000   $ 11,232,000
Amortization $ (156,000)