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Leases (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Mar. 08, 2019 USD ($) | Jan. 01, 2019 USD ($)
Operating Leased Assets [Line Items] |  |  |  |  |
Net present value of operating lease aggrements | $ 24,262 | $ 24,262 |  |  |
Weighted average discount rate | 5.50% | 5.50% |  |  |
Weighted average remaining lease term | 5 years 10 months 24 days | 5 years 10 months 24 days |  |  | 6 years
Deferred rent obligations | $ 2,400 | $ 2,400 |  |  |
Operating lease, option to terminate, period |  | 29 years |  |  |
Operating lease, termination option, notice period requirement |  | 2 years |  |  |
Right-of-use asset | 22,413 | $ 22,413 |  |  |
Number of subleases | item |  | 2 |  |  |
Sublease income | $ 226 | $ 452 | $ 910 |  |
Minimum [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Lease terms | 1 year | 1 year |  |  |
Maximum [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Lease terms | 11 years | 11 years |  |  |
Lease period of omitted leases |  | 12 months |  |  |
On-X [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Right-of-use asset |  |  |  | $ 3,700 |
Discount rate |  |  |  | 5.83% |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Net present value of operating lease aggrements |  |  |  |  | $ 22,700

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- Definition For a classified balance sheet, the cumulative difference between the rental income or payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, more than one year after the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.26(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39927-112707 + Details
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