Cash Interest Payments, Expected Payments in Year Five

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Cash Interest Payments, Expected Payments in Year Four

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Cash Interest Payments, Expected Payments in Year One

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Cash Interest Payments, Expected Payments in Year Six and Thereafter

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Cash Interest Payments, Expected Payments in Year Three

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Cash Interest Payments, Expected Payments in Year Two

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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.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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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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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 (premium).

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Amount, after accumulated amortization, of debt premium.

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Weighted average interest rate of debt outstanding.

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

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The amount of cash paid for interest during the period.

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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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Amount of increase (decrease) of the credit facility.

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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.

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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 of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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 interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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The total amount due within more than 12 month, or the operating cycle if longer, on all notes payable to banks paid on an installment. This can include the amount of any loans from the applicant firm. This does not, however, include any mortgage balances.

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Amount of long-term notes payable classified as other.

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

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The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Amount of cash outflow for the payment of debt classified as other.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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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 Level 4 (Details) - USD ($) $ in Thousands	12 Months Ended
Debt Level 4 (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2016
Debt Instrument [Line Items]
Line of Credit Facility, Increase (Decrease), Net	$ 135,000
Repayments of Long-term Capital Lease Obligations	33,119	$ 28,601	$ 29,380
Repayments of Debt		357,600
Repayments of Long-term Debt	36,414	160,220	230,561
Repayments of Other Debt	200	200
Losses on early extinguishment of debt, net	(22,503)	(6,918)	(29,158)
Notes Payable to Bank, Noncurrent	0	310,000
Bank credit facility		500,000		$ 500,000
Total debt	3,286,590	3,124,428
Current maturities of long-term debt	(89,974)	(86,823)
Less current maturities	89,974	86,823
Total long-term debt	$ 3,196,616	$ 3,037,605
Debt, Weighted Average Interest Rate	4.68%	5.18%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	63.00%	76.00%
Next Twelve Months	$ 94,725
Year Two	350,609
Year Three	74,169
Year Four	295,231
Year Five	647,792
After Year Five	1,848,735
Long-term Debt, Gross	3,311,261
Letters of Credit, Maximum Borrowing Capacity	32,700	$ 175,000		100,000
Interest Paid	156,950	164,748	$ 175,327
Payments in 2017	152,682
Payments in 2018	147,342
Payments in 2019	132,269
Payments in 2020	130,745
Payments in 2021	99,515
Payments in 2022 and thereafter	197,077
Debt Instrument, Unamortized Premium	11,300
Unamortized Debt Issuance Expense	(32,984)	(42,491)
April 2016 [Member]
Debt Instrument [Line Items]
Repayments of Debt		197,400
June 2017 [Member]
Debt Instrument [Line Items]
Repayments of Debt	295,000
July 2018 [Member]
Debt Instrument [Line Items]
Repayments of Debt	310,000	60,000
Bank credit facility	0	270,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Repayments of Debt	280,000	100,000
Bank Credit Facility due March 2021 [Domain]
Debt Instrument [Line Items]
Bank credit facility	350,000	0
Line of Credit Facility, Maximum Borrowing Capacity				$ 700,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Unamortized pricing discounts and other	8,313	8,636
Unsecured Debt [Member] \| June 2017 [Member]
Debt Instrument [Line Items]
Senior Notes	0	295,000
Unsecured Debt [Member] \| October 2018 [Member]
Debt Instrument [Line Items]
Senior Notes	250,000	250,000
Unsecured Debt [Member] \| November 2020 [Member]
Debt Instrument [Line Items]
Senior Notes	200,000	200,000
Unsecured Debt [Member] \| November 2021 [Member]
Debt Instrument [Line Items]
Senior Notes	150,000	150,000
Unsecured Debt [Member] \| January 2022 [Member]
Debt Instrument [Line Items]
Senior Notes	425,000	425,000
Unsecured Debt [Member] \| April 2027 [Member]
Debt Instrument [Line Items]
Senior Notes	200,000	200,000
Unsecured Debt [Member] \| May 2024 [Member]
Debt Instrument [Line Items]
Senior Notes	850,000	850,000
Unsecured Debt [Member] \| July 2018 [Member]
Debt Instrument [Line Items]
Bank credit facility	0	270,000
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Obligations under capital leases	208,758	204,246
Mortgages [Member]
Debt Instrument [Line Items]
Mortgage notes and other debt, maturities through 2047	$ 3,753	$ 4,037