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Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Option	Mar. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Operating lease right-of-use assets	$ 8,768		$ 9,200
Operating lease liabilities	$ 10,927		11,000
Initial term of lease	12 months
Number of options to renew lease | Option	1
Minimum
Renewal terms to extend the lease	1 year
Maximum
Renewal terms to extend the lease	5 years
Building
Operating lease cost	$ 900	$ 800
Automobile
Operating lease cost	$ 300	$ 300
Accounting Standards Update 2016-02 | Adjustment
Operating lease right-of-use assets			9,200
Accounting Standards Update 2016-02 | Adjustment | Other Accrued Expenses
Operating lease liabilities			2,500
Accounting Standards Update 2016-02 | Adjustment | Long Term Lease Liabilities
Operating lease liabilities			$ 8,500

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+ References

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- Definition

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+ References

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- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

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