Convertible Notes principal amount denominator for trading price

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Debt Instrument, Fair Value Disclosure, Narrative

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Maximum Allowable Percentage Of The Product Of Last Reported Sale Price of Common Stock And Conversion Rate For Convertible Notes Payable

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Maximum Days After Any Five Trading Day Period In Which Trading Price Was Less Than 97 Percent Of Last Reported Sale Price of Common Stock Times Conversion Rate

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- Definition

Net Cost Of Convertible Note Hedge And All Capped Transactions

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- Definition

Number Of Shares Of Convertible Debt Hedged And Capped Call

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Percent Of The Principal Amount Of The Convertible Notes Plus Accrued Interest To Be Purchased By The Company Subject Company Undergoing A Fundamental Change

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No definition available.

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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- Definition

Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

+ References

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

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- Definition

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

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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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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Debt and Credit Arrangements Convertible Notes (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Interest accretion of convertible notes discount			$ 6,619,000	$ 6,118,000
Financing costs amortization	$ 321,000	$ 321,000	642,000	642,000
Convertible Notes, Due 2018 [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 250,000,000		$ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage	2.00%		2.00%
Debt Instrument, Convertible, Effective Interest Rate	7.90%		7.90%
Number Of Shares Of Convertible Debt Hedged And Capped Call	3,622		3,622
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 84.96		$ 84.96
Proceeds from Issuance of Warrants			$ 48,848,000
Net Cost Of Convertible Note Hedge And All Capped Transactions			17,638,000
Convertible Debt, Noncurrent	$ 234,734,000		234,734,000		$ 228,115,000
Unamortized Debt Issuance Expense	770,000		770,000		1,125,000
Unamortized discount	15,266,000		15,266,000		$ 21,885,000
Debt Instrument, Convertible, Interest Expense	4,592,000	4,339,000	9,119,000	8,618,000
Interest Expense, Debt, Excluding Amortization	1,250,000	1,250,000	2,500,000	2,500,000
Interest accretion of convertible notes discount	3,342,000	3,089,000	6,619,000	6,118,000
Deferred Finance Costs, Gross	7,277,000		7,277,000
Financing costs amortization	$ 178,000	$ 178,000	$ 355,000	$ 355,000
Debt Instrument, Convertible, Threshold Consecutive Trading Days			20 days
Debt Instrument, Convertible, Threshold Trading Days			30
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger			130.00%
Debt Instrument, Convertible, Conversion Price	$ 69.03		$ 69.03
Maximum Days After Any Five Trading Day Period In Which Trading Price Was Less Than 97 Percent Of Last Reported Sale Price of Common Stock Times Conversion Rate			5 days
Convertible Notes Principal Amount Denominator For Trading Price	$ 1,000		$ 1,000
Maximum Allowable Percentage Of The Product Of Last Reported Sale Price of Common Stock And Conversion Rate For Convertible Notes Payable	97.00%		97.00%
Percent Of The Principal Amount Of The Convertible Notes Plus Accrued Interest To Be Purchased By The Company Subject Company Undergoing A Fundamental Change	100.00%		100.00%
Debt Instrument, Fair Value Disclosure, Narrative			The fair value of the Convertible Notes was approximately 99% of their par value and approximately 96% of their par value as of June 30, 2017 and December 31, 2016, respectively
Liability Component [Member] \| Convertible Notes, Due 2018 [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 170,885,000		$ 170,885,000
Deferred Finance Costs, Gross	4,974,000		4,974,000
Equity Component [Member] \| Convertible Notes, Due 2018 [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	79,115,000		79,115,000
Deferred Finance Costs, Gross	$ 2,303,000		$ 2,303,000