Long-Term Debt, Net of Current (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Apr. 30, 1998
Debt Instrument [Line Items]
Gross	$ 1,653,178	$ 1,364,008
Debt Issuance Costs	(24,368)	(27,334)
Net	1,628,810	1,336,674
Less current portion of long-term debt	(43,863)	(48,497)
Long-term debt, net of current portion, gross	1,609,315	1,315,511
Long-term debt, net of current portion, debt issuance costs	(24,368)	(27,334)
Long-term debt, net of current portion, net	$ 1,584,947	1,288,177
7.25% senior notes due June 2021
Debt Instrument [Line Items]
Debt instrument, stated interest rate percentage	7.25%
Acquisition-related note [Member] \| Non-interest bearing acquisition note, $5.0 million installment due March 2016
Debt Instrument [Line Items]
Gross	$ 0	4,924
Debt Issuance Costs	0	0
Net	$ 0	4,924
Notes [Member] \| 7.25% senior notes due June 2021
Debt Instrument [Line Items]
Debt instrument, stated interest rate percentage	7.25%
Gross	$ 393,000	393,000
Debt Issuance Costs	(10,189)	(11,121)
Net	$ 382,811	381,879
Notes [Member] \| 7.55% senior debentures due April 2028
Debt Instrument [Line Items]
Debt instrument, stated interest rate percentage	7.55%		7.55%
Gross	$ 59,645	59,645
Debt Issuance Costs	(222)	(231)
Net	$ 59,423	$ 59,414
Notes [Member] \| Term loan facility borrowings due April 2020, weighted-average interest rate of 2.19% and 1.96% as of June 30, 2016 and December 31, 2015, respectively
Debt Instrument [Line Items]
Debt instrument, stated interest rate percentage	2.19%	1.96%
Bank debt [Member] \| Term loan facility borrowings due April 2020, weighted-average interest rate of 2.19% and 1.96% as of June 30, 2016 and December 31, 2015, respectively
Debt Instrument [Line Items]
Gross	$ 807,500	$ 828,750
Debt Issuance Costs	(8,431)	(9,720)
Net	$ 799,069	$ 819,030
Revolving line of credit [Member] \| Revolving line of credit borrowings due April 2020, weighted-average interest rate of 2.19% and 1.96% as of June 30, 2016 and December 31, 2015, respectively
Debt Instrument [Line Items]
Debt instrument, stated interest rate percentage	2.19%	1.96%
Gross	$ 390,000	$ 75,000
Debt Issuance Costs	(5,526)	(6,262)
Net	384,474	68,738
Other debt [Member] \| Various debt instruments with maturities through 2019
Debt Instrument [Line Items]
Gross	3,033	2,689
Debt Issuance Costs	0	0
Net	$ 3,033	$ 2,689

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Unamortized Debt Issuance Expense, Net

+ References

No definition available.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 210
-Section S99
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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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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