Long-Term Debt, Net of Current (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Gross	$ 1,822,427	$ 1,619,279
Debt Issuance Costs	(25,124)	(17,232)
Net	1,797,303	1,602,047
Less current portion of long-term debt	92,454	105,158
Long-term debt, net of current portion, gross	1,729,973	1,514,121
Long-term debt, net of current portion, debt issuance costs	(25,124)	(17,232)
Long-term debt, net of current portion, net	1,704,849	1,496,889
Term loan facility [Member] \| Term Loan Due August 2022 [Member]
Debt Instrument [Line Items]
Gross	1,800,000	0
Debt Issuance Costs	(18,039)	0
Net	1,781,961	0
Term loan facility [Member] \| Term Loan Due April 2020 [Member]
Debt Instrument [Line Items]
Gross	0	1,298,125
Debt Issuance Costs	0	(12,419)
Net	0	1,285,706
Lind of Credit due August 2022 [Member] \| Revolving line of credit [Member]
Debt Instrument [Line Items]
Gross	0	0
Debt Issuance Costs	(7,036)	0
Net	(7,036)	0
Line of credit [Member] \| Revolving line of credit [Member]
Debt Instrument [Line Items]
Gross	0	302,000
Debt Issuance Costs	0	(4,761)
Net	0	297,239
Senior notes [Member] \| 7.55% senior debentures due April 2028 [Member]
Debt Instrument [Line Items]
Gross	14,645	14,645
Debt Issuance Costs	(49)	(52)
Net	14,596	14,593
Other debt [Member] \| Various debt instruments with maturities through 2019 [Member]
Debt Instrument [Line Items]
Gross	7,782	4,509
Debt Issuance Costs	0	0
Net	$ 7,782	$ 4,509

Long-term Debt, Excluding Current Maturities Gross

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- Definition

Unamortized Debt Issuance Expense, Net

+ 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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.

+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03(16))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

+ References

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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.

+ References

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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.

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