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Financing Arrangements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Notes Payable, Current and Noncurrent [Abstract]
Current portion of notes payable		$ 334
Long-term portion of notes payable	$ 205,372	195,908
Convertible notes payable, 2.16% to 3.84%, due 2015, VIE
Notes Payable, Current and Noncurrent [Abstract]
Current portion of notes payable	$ 0	334
Convertible notes payable, 2.16% to 3.84%, due 2015, VIE | Minimum
Notes Payable, Current and Noncurrent [Abstract]
Interest on debt instrument (percent)	2.16%
Convertible notes payable, 2.16% to 3.84%, due 2015, VIE | Maximum
Notes Payable, Current and Noncurrent [Abstract]
Interest on debt instrument (percent)	3.84%
2019 Convertible Senior Notes
Notes Payable, Current and Noncurrent [Abstract]
Principal amount outstanding	$ 245,000	245,000
Unamortized discount	(39,628)	(49,092)
Long-term portion of notes payable	$ 205,372	$ 195,908

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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-Section 45
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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.5-02.22)
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Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

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