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Lease Obligations (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Rent expense | $ 13,232 | $ 13,960 | $ 10,427
Payment of base rent in 2016 | $ 1,074 |  |
Rock Hill Facility [Member] |  |  |
Lease expiration date | Aug. 31, 2021 |  |
Number of lease renewal terms | item | 2 |  |
Lease renewal terms | 5 years |  |
Payment of base rent in 2016 | $ 683 |  |
Payment of base rent in 2017 through 2020 | 709 |  |
Payment of base rent in 2021 | $ 723 |  |
Implicit interest rate | 6.93% | 6.93% |
Other Capital Lease Obligations [Member] |  |  |
Lease expiration date | Aug. 01, 2018 |  |
Minimum [Member] | Other Capital Lease Obligations [Member] |  |  |
Implicit interest rate | 1.75% |  |
Maximum [Member] | Other Capital Lease Obligations [Member] |  |  |
Implicit interest rate |  | 8.06% |

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- Definition Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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