Capital and Financing Transactions - Notes Payable to Banks (Details) - USD ($)	6 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Notes Payable to Banks, Net
Debt Instrument [Line Items]
Notes payable to banks outstanding	$ 550,000,000	$ 550,000,000
Unamortized debt issuance costs, net	(6,258,000)	(7,120,000)
Notes payable to banks, net	$ 543,742,000	542,880,000
$10.0 Million Working Capital Revolving Credit Facility
Debt Instrument [Line Items]
Interest Rate	1.80%
Initial Maturity	Mar. 30, 2018
$10.0 Million Working Capital Revolving Credit Facility \| Notes Payable to Banks, Net
Debt Instrument [Line Items]
Notes payable to banks outstanding	$ 0	0
Maximum borrowing capacity	$ 10,000,000.0
$450.0 Million Revolving Credit Facility
Debt Instrument [Line Items]
Interest Rate	1.80%
Initial Maturity	Mar. 30, 2018
$450.0 Million Revolving Credit Facility \| Notes Payable to Banks, Net
Debt Instrument [Line Items]
Notes payable to banks outstanding	$ 0	0
Maximum borrowing capacity	$ 450,000,000.0
$250.0 Million Five-Year Term Loan
Debt Instrument [Line Items]
Interest Rate	2.60%
Initial Maturity	Mar. 29, 2019
$250.0 Million Five-Year Term Loan \| Notes Payable to Banks, Net
Debt Instrument [Line Items]
Notes payable to banks outstanding	$ 250,000,000	250,000,000
Term of loan agreement	5 years
Face amount of unsecured term loan	$ 250,000,000.0
$200.0 Million Five-Year Term Loan
Debt Instrument [Line Items]
Interest Rate	1.80%
Initial Maturity	Jun. 26, 2020
$200.0 Million Five-Year Term Loan \| Notes Payable to Banks, Net
Debt Instrument [Line Items]
Notes payable to banks outstanding	$ 200,000,000	200,000,000
Term of loan agreement	5 years
Face amount of unsecured term loan	$ 200,000,000.0
$100.0 Million Seven-Year Term Loan
Debt Instrument [Line Items]
Interest Rate	4.40%
Initial Maturity	Mar. 31, 2021
$100.0 Million Seven-Year Term Loan \| Notes Payable to Banks, Net
Debt Instrument [Line Items]
Notes payable to banks outstanding	$ 100,000,000	$ 100,000,000
Term of loan agreement	7 years
Face amount of unsecured term loan	$ 100,000,000.0

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.

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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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 30
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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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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

+ 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

Reference 2: 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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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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