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Property and Equipment, Net - Depreciation Expense Table (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Depreciation Expense [Line Items] |  |  |
Depreciation expense | $ 26,950 | $ 24,390 | $ 22,570
Continuing Operations [Member] |  |  |
Depreciation Expense [Line Items] |  |  |
Depreciation expense | 26,950 | 24,390 | 22,570
Cost of Sales [Member] | Continuing Operations [Member] |  |  |
Depreciation Expense [Line Items] |  |  |
Depreciation expense | 24,950 | 21,620 | 19,730
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member] |  |  |
Depreciation Expense [Line Items] |  |  |
Depreciation expense | $ 2,000 | $ 2,770 | $ 2,840

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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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