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Property and Equipment, Net - Depreciation Expense Table (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Depreciation Expense [Line Items] |  |  |  |
Depreciation expense |  |  | $ 12,870 | $ 13,050
Continuing Operations [Member] |  |  |  |
Depreciation Expense [Line Items] |  |  |  |
Depreciation expense | $ 6,540 | $ 7,250 | 12,870 | 13,050
Cost of Sales [Member] | Continuing Operations [Member] |  |  |  |
Depreciation Expense [Line Items] |  |  |  |
Depreciation expense | 6,030 | 6,740 | 11,840 | 11,940
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member] |  |  |  |
Depreciation Expense [Line Items] |  |  |  |
Depreciation expense | $ 510 | $ 510 | $ 1,030 | $ 1,110

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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