Long-Term Debt, Net of Current (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Apr. 30, 1998
Debt Instrument [Line Items]
Gross	$ 1,633,554	$ 1,364,008
Debt Issuance Costs	(18,846)	(27,334)
Net	1,614,708	1,336,674
Less current portion of long-term debt	87,484	48,497
Long-term debt, net of current portion, gross	1,546,070	1,315,511
Long-term debt, net of current portion, debt issuance costs	(18,846)	(27,334)
Long-term debt, net of current portion, net	1,527,224	1,288,177
Term loan facility [Member] \| Term Loan Due April 2020 [Member]
Debt Instrument [Line Items]
Gross	1,315,313	828,750
Debt Issuance Costs	(13,479)	(9,720)
Net	$ 1,301,834	$ 819,030
Debt instrument, weighted average interest rate	2.25%	1.96%
Line of credit [Member] \| Revolving line of credit [Member]
Debt Instrument [Line Items]
Gross	$ 255,000	$ 75,000
Debt Issuance Costs	(5,150)	(6,262)
Net	$ 249,850	$ 68,738
Debt instrument, weighted average interest rate	2.24%	1.96%
Senior notes [Member] \| 7.25% senior notes due June 2021 [Member]
Debt Instrument [Line Items]
Gross	$ 0	$ 393,000
Debt Issuance Costs	0	(11,121)
Net	$ 0	381,879
Debt instrument, stated interest rate percentage	7.25%
Senior notes [Member] \| 7.55% senior debentures due April 2028 [Member]
Debt Instrument [Line Items]
Gross	$ 59,645	59,645
Debt Issuance Costs	(217)	(231)
Net	$ 59,428	59,414
Debt instrument, stated interest rate percentage	7.55%		7.55%
Other debt [Member] \| Non-interest bearing acquisition note, $5.0 million installment due March 2016 [Member]
Debt Instrument [Line Items]
Gross	$ 0	4,924
Debt Issuance Costs	0	0
Net	0	4,924
Other debt [Member] \| Various debt instruments with maturities through 2019 [Member]
Debt Instrument [Line Items]
Gross	3,596	2,689
Debt Issuance Costs	0	0
Net	$ 3,596	$ 2,689

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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- Definition

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.

+ References

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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
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-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

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- Definition

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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- Definition

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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- Definition

Weighted average interest rate of long-term debt outstanding.

+ References

No definition available.

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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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