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Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts receivable, allowance for doubtful accounts
Balance at beginning of year	$ 512us-gaap_ValuationAllowancesAndReservesBalance	$ 495us-gaap_ValuationAllowancesAndReservesBalance	$ 379us-gaap_ValuationAllowancesAndReservesBalance
Provision credited to expense	63us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense	22us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense	113us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Recoveries, net of write-offs	(73)us-gaap_ValuationAllowancesAndReservesDeductions	(5)us-gaap_ValuationAllowancesAndReservesDeductions	3us-gaap_ValuationAllowancesAndReservesDeductions
Balance at end of year	$ 502us-gaap_ValuationAllowancesAndReservesBalance	$ 512us-gaap_ValuationAllowancesAndReservesBalance	$ 495us-gaap_ValuationAllowancesAndReservesBalance

X

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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