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Property, Plant, and Equipment, Net (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2016
Construction in progress |  | $ 88,909 | $ 88,909 | $ 252,763 |  | $ 88,909
Asset Impairment Charges | $ 3,138 |  |  |  | $ 3,138 | 0
Property, plant and equipment held for sale |  |  |  | 681 |  |
Depreciation expense |  |  | 41,550 | 45,994 | $ 43,773 |
Service Life [Member] |  |  |  |  |  |
Depreciation expense |  |  | (12,000) |  |  |
Second Campus Rockford Illinois [Member] |  |  |  |  |  |
Construction in progress |  | 26,741 | 26,741 | 47,629 |  | 26,741
Capitalized interest |  | 341 | 341 | 499 |  | 341
New Campus Fort Collins Colorado [Member] |  |  |  |  |  |
Construction in progress |  | 247 | 247 | 151,669 |  | 247
Capitalized interest |  | 0 | 0 | $ 5,205 |  | 0
Building and Building Improvements [Member] | New Campus Fort Collins Colorado [Member] |  |  |  |  |  |
Contruction in progress placed into service |  | 160,000 |  |  |  |
Office furniture and equipment [Member] |  |  |  |  |  |
Gross assets acquired on capital leases |  | 1,653 | 1,653 |  |  | 1,653
Accumulated depreciation on capital lease assets |  | $ 322 | $ 322 |  |  | $ 322

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- Definition Amount before accumulated depreciation of leased 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 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + 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 + Details
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