Long-Term Debt (Details) (USD $)	12 Months Ended	1 Months Ended
Dec. 31, 2014	Aug. 31, 2011	Dec. 31, 2013
Debt Instrument [Line Items]
Unsecured notes	$ 250,000,000us-gaap_UnsecuredDebt		$ 250,000,000us-gaap_UnsecuredDebt
Long-term Debt, Gross	123,750,000us-gaap_DebtInstrumentCarryingAmount		138,750,000us-gaap_DebtInstrumentCarryingAmount
Unamortized issuance costs	(764,000)		(1,222,000)
Long-term Debt	372,986,000us-gaap_LongTermDebt		387,528,000us-gaap_LongTermDebt
Current portion, long-term debt	15,000,000us-gaap_LongTermDebtCurrent		15,000,000us-gaap_LongTermDebtCurrent
Long-term Debt, Excluding Current Maturities	357,986,000us-gaap_LongTermDebtNoncurrent		372,528,000us-gaap_LongTermDebtNoncurrent
Senior unsecured notes, term	5 years
Senior unsecured notes, interest payments	quarterly
3.75 % senior unsecured notes due September 1, 2016
Debt Instrument [Line Items]
Senior unsecured notes, issued amount		250,000,000
Senior unsecured notes, interest rate		3.75%
Senior unsecured notes, maturity date		Sep. 01, 2016
Senior unsecured notes, proceeds		247,700,000
Senior unsecured notes, term	5 years
Senior unsecured notes, interest payments		semiannually
Senior unsecured notes, interest payment dates		March 1 and September 1
Long-term Debt [Member]
Debt Instrument [Line Items]
Senior unsecured notes, maturity date	Apr. 05, 2019
Debt Instrument, Periodic Payment, Principal	$ 3,750,000
Debt Instrument, Description of Variable Rate Basis	Interest is accrued at a one-month LIBOR rate

Debt Instrument, Interest Payment Dates

No definition available.

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- Definition

Debt Instrument Issuance Costs Amortization [Period]

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No definition available.

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- Definition

Debt Instrument, Unamortized Debt Issuance Expense and Discount (Premium)

+ References

No definition available.

+ Details

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- Definition

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 SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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- Definition

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

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-Publisher FASB

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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

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-Number 210

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

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- Definition

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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- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled 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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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). 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 cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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-Publisher FASB

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-Glossary Financing Activities

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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