Long-Term Debt (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Senior Notes	$ 191,429,000	$ 227,143,000
Maximum borrowing capacity	300,000,000
Minimum increments under the additional borrowings	25,000,000
Interest Rate Spread added to LIBOR Rate	1.00%
Interest Rate Spread added to Federal Funds Rate	0.50%
Line of credit, outstanding	0	10,000,000
Facing fee on outstanding amount of letter of credit	0.125%
Minimum amount of dividends payable to shareholder as per credit agreement	20,000,000.0
Percentage of preceding year net income payable as dividend	25.00%
Letter Of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	150,000,000
Line of credit, outstanding	57,700,000	52,400,000
Sweep Program [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	20,000,000
Five-Year Senior Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Current borrowing capacity	200,000,000
Applicable Margin Interest On Credit Facility Low End	1.00%
Applicable Margin Interest On Credit Facility High End	1.875%
Interest Rate Spread added to LIBOR Rate	1.00%	1.125%
Senior Notes [Member]
Debt Instrument [Line Items]
Periodic principal payments	$ 35,700,000
Fixed interest rate, minimum	4.00%
Fixed interest rate, maximum	5.85%
Effective average interest rate	4.99%	5.07%
Maximum [Member]
Debt Instrument [Line Items]
Interest Rate Spread added to LIBOR Rate	1.125%
Letter of credit fee	1.125%
Commitment fee percentage	0.20%
Line Of Credit Facility Commitment Stated Fee Percentage	0.30%
Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Spread added to LIBOR Rate	1.00%
Letter of credit fee	1.00%
Commitment fee percentage	0.175%
Line Of Credit Facility Commitment Stated Fee Percentage	0.175%

Annual Rate Of Facing Fee On Daily Average Aggregate Amount Of Letter Of Credit

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- Definition

Applicable Margin Interest On Credit Facility High End

+ References

No definition available.

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- Definition

Applicable Margin Interest On Credit Facility Low End

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No definition available.

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- Definition

The percentage points added to the federal funds rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

The effective interest rate during the reporting period on the outstanding letters of credit.

+ References

No definition available.

+ Details

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- Definition

The stated contractual fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- Definition

Line Of Credit Facility Minimum Increments Under Additional Borrowings

+ References

No definition available.

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- Definition

Minimum Amount Of Dividend Payable To Shareholder

+ References

No definition available.

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- Definition

Percentage Of preceding Fiscal Year Net Income Amount Payable As Dividend

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Topic 210

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-Section S99

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-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

Minimum contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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-Subparagraph (SX 210.5-02.22(a)(2))

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- Definition

Amount of the required periodic payments applied to principal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.19(b),22(b))

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-Paragraph 19, 22

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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.

+ References

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- Definition

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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-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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-Section S99

-Paragraph 1

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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