Debt Instrument, Covenant, Maximum Cash Flow Ratio

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- Definition

Debt Insturment, Covenant, Minimum Interest Coverage Ratio

+ References

No definition available.

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- Definition

Amount of cash used to cover repayment of principal, accrued interest and fees associated with a debt extinguishment.

+ References

No definition available.

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- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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- Definition

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

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+ Details

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- Definition

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

+ 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

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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- Definition

Amount, after accumulated amortization, of debt discount.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

+ Details

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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.

+ References

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- 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

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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- 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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Debt (Narrative) (Details) $ in Thousands	3 Months Ended	12 Months Ended
Debt (Narrative) (Details) $ in Thousands	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jul. 28, 2017 USD ($)	Jul. 15, 2016 USD ($)	Mar. 30, 2016 USD ($)	Dec. 17, 2012 USD ($)
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 3,150,000	$ 2,858,000
Debt Issuance Costs, Gross						$ 10,400
Unamortized Debt Issuance Expense		16,967	15,062			9,400
Amortization of Debt Issuance Costs	$ 1,000
Gains (Losses) on Extinguishment of Debt	3,000	(3,004)	(50,639)	$ 0
Debt Instrument, Unamortized Discount		33,776	23,675
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 500,000
Term-A Facility [Member]
Debt Instrument [Line Items]
Debt Insturment, Covenant, Minimum Interest Coverage Ratio		2.50
Term-A Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%
Term-A Facility [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Term-A Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.25%
Debt instrument, covenant, cash flow ratio		5.00
Term-A Facility [Member] \| Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.25%
Term-A Facility [Member] \| Minimum [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.25%
Term-A Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.50%
Debt instrument, covenant, cash flow ratio		6.00
Term-A Facility [Member] \| Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.25%
Term-A Facility [Member] \| Maximum [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.25%
Term-A Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 750,000	$ 1,258,000			750,000
Repayments of Debt	$ 400,000
4.75% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						800,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net						$ 14,000
Debt Instrument, Interest Rate, Stated Percentage		4.75%
4.75% Senior Notes Due 2025 [Member] \| Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		104.75%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed		35.00%
4.75% Senior Notes Due 2025 [Member] \| Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%
4.75% Senior Notes Due 2025 [Member] \| Minimum [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		102.375%
5.00% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								$ 1,000,000
Debt Issuance Costs, Gross								2,100
Debt Instrument, Unamortized Discount								17,500
Debt Instrument, Interest Rate, Stated Percentage		5.00%
5.00% Senior Notes [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		102.50%
5.00% Senior Notes [Member] \| Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%
7.75% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.75%
Debt Instrument, Repurchased Face Amount							$ 45,600
Debt extinguishment including principal interest and fees								$ 703,000
4.75% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount									$ 600,000
Debt Issuance Costs, Gross									1,500
Debt Instrument, Unamortized Discount									$ 10,500
Debt Instrument, Interest Rate, Stated Percentage		4.75%
4.75% Senior Notes [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		102.375%
4.75% Senior Notes [Member] \| Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%
Term-B Facility [Member]
Debt Instrument [Line Items]
Repayments of Debt					$ 587,600