Long-Term Debt and Capital Lease Obligations - Convertible Notes (Details) - 2.50% Convertible Notes - USD ($)	Sep. 30, 2016	Mar. 30, 2015
Debt Instrument [Line Items]
Aggregate principal amount of convertible notes	$ 115,000,000	$ 115,000,000
Unamortized debt issuance costs	(2,124,000)
Unamortized debt discounts	(27,661,000)
Net carrying value of Convertible Notes	$ 85,215,000

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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Face (par) amount of debt instrument at time of issuance.

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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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