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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)

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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