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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	$ 201,985	$ 334
Long-term portion of notes payable		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	$ (43,015)	(49,092)
Long-term portion of notes payable		$ 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=64930739&loc=d3e28878-108400

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-Publisher FASB
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-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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=64930785&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
-Topic 210
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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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