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Convertible senior notes, 2015 Convertible Notes (Details 2) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Aug. 31, 2015
Long-term debt
Less: Debt issuance costs	$ (2,500,000)
Convertible debt | 3.00% Convertible senior notes due 2022
Long-term debt
Principal	150,000,000	$ 150,000,000	$ 150,000,000
Less: Debt issuance costs	(2,457,000)	(2,760,000)
Less: Debt discount, net	(49,327,000)	(55,392,000)
Net carrying amount	$ 98,216,000	$ 91,848,000

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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No definition available.

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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