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- Definition

leverage ratio

+ References

No definition available.

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- Definition

Liability component of the gross proceeds of Convertible Notes prior to their maturity date.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(13))
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

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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.

+ References

+ Details

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- Definition

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

+ References

+ Details

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- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

+ References

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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- Definition

Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section S45
-Paragraph 1
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

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Long-Term Debt Additional Information (Details) $ / shares in Units, $ in Thousands			3 Months Ended	12 Months Ended
	May 15, 2026	Sep. 12, 2016	Mar. 31, 2018 USD ($) $ / shares Rate	Dec. 31, 2017 USD ($) Rate	Sep. 14, 2016 USD ($)
Debt Instrument
Convertible Note, Conversion Price \| $ / shares			$ 85.39
Debt Instrument, Maturity Date	May 15, 2026		Sep. 15, 2021
Debt Issuance Costs, Line of Credit Arrangements, Net			$ 5,500	$ 6,200
Supplementary Leverage Ratio			1.7
Current Ratio			2.5
5.75% Senior Notes due 2026 [Member]
Debt Instrument
Debt Instrument, Interest Rate, Stated Percentage \| Rate				5.75%
Debt Instrument, Issuance Date				Nov. 29, 2017
1.125% Convertible Senior Notes due 2021 [Member]
Debt Instrument
Debt Instrument, Interest Rate, Stated Percentage \| Rate			1.125%
Debt Instrument, Issuance Date			Sep. 12, 2016
6.125% Senior Notes due 2024 [Member]
Debt Instrument
Debt Instrument, Interest Rate, Stated Percentage \| Rate			6.125%
Debt Instrument, Issuance Date		Sep. 12, 2016
Revolving Credit Facility
Debt Instrument
Line of Credit Facility, Expiration Date			May 21, 2020
5.75% Senior Notes due 2026 [Member]
Debt Instrument
Convertible senior notes fair value				$ 600,000
Debt Issuance Costs, Gross				$ 7,600
Minimum [Member] \| Revolving Credit Facility
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity ($)			$ 700,000
Maximum [Member] \| Revolving Credit Facility
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity ($)			950,000
Maximum Borrowing Base [Member] \| Revolving Credit Facility
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity ($)			$ 1,100,000
First Payment \| 5.75% Senior Notes due 2026 [Member]
Debt Instrument
Debt Instrument, Frequency of Periodic Payment				May 15
First Payment \| 1.125% Convertible Senior Notes due 2021 [Member]
Debt Instrument
Debt Instrument, Frequency of Periodic Payment			March 15
First Payment \| 6.125% Senior Notes due 2024 [Member]
Debt Instrument
Debt Instrument, Frequency of Periodic Payment			March 15
Second Payment \| 5.75% Senior Notes due 2026 [Member]
Debt Instrument
Debt Instrument, Frequency of Periodic Payment				November 15
Second Payment \| 1.125% Convertible Senior Notes due 2021 [Member]
Debt Instrument
Debt Instrument, Frequency of Periodic Payment			September 15
Second Payment \| 6.125% Senior Notes due 2024 [Member]
Debt Instrument
Debt Instrument, Frequency of Periodic Payment			September 15
Revolving Credit Facility
Debt Instrument
Long-term Line of Credit			$ 0	$ 0
1.125% Convertible Senior Notes due 2021 [Member]
Debt Instrument
Convertible senior notes fair value			200,000	200,000
Liability component of gross proceeds of Convertible Notes			160,500
Unamortized Debt Issuance Expense			$ (3,371)	$ (3,615)	$ (4,800)
Debt Instrument, Interest Rate, Effective Percentage \| Rate			5.80%
Alternate Base Rate Option [Member]
Debt Instrument
Line of Credit Facility, Interest Rate at Period End \| Rate			1.25%
LIBOR Option [Member]
Debt Instrument
Line of Credit Facility, Interest Rate at Period End \| Rate			2.25%
Unused Commitment Fee [Member]
Debt Instrument
Line of Credit Facility, Interest Rate at Period End \| Rate			0.50%