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Property and Equipment (Summary Of Property And Equipment) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 50,486 | $ 44,138
Less accumulated depreciation | (21,737) | (14,143)
Property, and equipment, net | 28,749 | 29,995
Generators and Other Capital Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 15,754 | 13,087
Property, and equipment, net | $ 4,656 | 5,692
Building under Capital Lease [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 15 years |
Property and equipment, gross | $ 14,250 | 14,250
Computer and Other Office Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 3 years |
Property and equipment, gross | $ 5,873 | 5,321
Machinery, Equipment and Vehicles [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 4,576 | 3,731
Furniture and Fixtures [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 4,366 | 3,676
Leasehold Improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 3,636 | 3,319
Construction in Progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 1,810 | 539
Equipment under Capital Leases [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 221 | $ 215
Minimum [Member] | Generators and Other Capital Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 1 year |
Minimum [Member] | Machinery, Equipment and Vehicles [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 3 years |
Minimum [Member] | Furniture and Fixtures [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 3 years |
Minimum [Member] | Leasehold Improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 5 years |
Minimum [Member] | Equipment under Capital Leases [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 3 years |
Maximum [Member] | Generators and Other Capital Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 3 years |
Maximum [Member] | Machinery, Equipment and Vehicles [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 7 years |
Maximum [Member] | Furniture and Fixtures [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 7 years |
Maximum [Member] | Leasehold Improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 15 years |
Maximum [Member] | Equipment under Capital Leases [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 5 years |

X
- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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