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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.

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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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No definition available.

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Amount, after accumulated amortization, of debt discount.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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Long-term Debt (Summary of Long-Term Debt) (Details) - USD ($) $ in Thousands	Jul. 28, 2017	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 2,747,000	$ 2,858,000
Unamortized discount		(22,106)	(23,675)
Unamortized deferred financing costs		(12,080)	(15,062)
Long-term debt, net		2,712,814	2,819,263
Current portion of long-term debt		259,000	222,000
Long-term debt		2,453,814	2,597,263
Term-A Facility [Member]
Debt Instrument [Line Items]
Long-term debt, net		1,137,123	1,245,175
5.00% Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt, net		$ 982,980	$ 981,949
Debt Instrument, Interest Rate, Stated Percentage		5.00%	5.00%
4.75% Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt, net		$ 592,711	$ 592,139
Debt Instrument, Interest Rate, Stated Percentage		4.75%	4.75%
Senior Notes [Member] \| 5.00% Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 1,000,000	$ 1,000,000
Senior Notes [Member] \| 4.75% Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		600,000	600,000
Secured Debt [Member] \| Term-A Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 1,147,000	$ 1,258,000
Subsequent Event [Member] \| 4.75% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Unamortized deferred financing costs	$ (1,800)
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Subsequent Event [Member] \| Secured Debt [Member] \| Term-A Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 750,000