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Lease Obligations (Narrative) (Details) $ in Thousands	12 Months Ended
	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

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+ References

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- Definition

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+ References

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- Definition

Capital Lease Future Minimum Payment Implicit Interest Rate

+ References

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- Definition

Capital Leases Future Minimum Payments Due In Six Years

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- Definition

Capital Leases Future Minimum Payments Due in Two Through Five Years

+ References

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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

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X

- 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.

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- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

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