Long-Term Debt - Convertible Senior Notes (Details)	3 Months Ended
Mar. 31, 2016 USD ($) day $ / shares	May. 05, 2015 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 232,600,000
Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		2.50%
Convertible debt		$ 223,100,000
Conversion ratio	25.5428
Conversion price (usd per share) \| $ / shares	$ 39.15
Convertible senior notes, principal amount	$ 230,000,000
Unamortized debt discount	(26,428,209)
Unamortized debt issuance costs	(5,226,948)
Convertible senior notes, net	198,344,843
Contractual coupon interest	1,400,000
Debt discount amortization	1,400,000
Debt issuance cost amortization	$ 300,000
Senior Notes [Member] \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Threshold trading days \| day	20
Threshold consecutive trading days	30 days
Stock price to conversion price trigger	130.00%
Senior Notes [Member] \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Threshold consecutive trading days	5 days
Stock price to conversion price trigger	98.00%
Senior Notes [Member] \| Debt Instrument, Redemption, Fundamental Change
Debt Instrument [Line Items]
Stock price to conversion price trigger	100.00%
Maximum \| Senior Notes [Member] \| Debt Instrument, Redemption, Fundamental Change
Debt Instrument [Line Items]
Conversion ratio	34.4827
Level 2 \| Senior Notes [Member]
Debt Instrument [Line Items]
Straight debt borrowing rate	5.75%
Fair value of liability component	$ 198,500,000
Fair value of equity component	$ 31,500,000
Effective interest rate	6.33%
Discount amortization period	5 years

Debt Instrument, Convertible, Carrying Amount of Debt Component

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Debt Instrument, Convertible, Stock Price to Conversion Price Trigger, Percent

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Debt Instrument, Interest Rate, Straight Debt Borrowing Rate

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Debt Instrument, Net of Debt Discount and Issuance Costs

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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 noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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.

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

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

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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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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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