Represents the number of days in which the debt instrument is scheduled to mature.

No definition available.

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- Definition

The debt instrument's year of maturity.

+ References

No definition available.

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- Definition

The percentage of principal amount applicable to the redemption of the Company, in whole or in part, at any time, of the issued debt.

+ References

No definition available.

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- Definition

The percentage of principal amount applicable to the required repurchases of the issued debt of the Company, when a change of control occurs.

+ References

No definition available.

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- Definition

Represents the number of pricing tranches into which certain debt or line of credit borrowings are grouped.

+ References

No definition available.

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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.

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- Definition

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

+ References

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-Publisher FASB

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-Topic 835

-SubTopic 30

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- Definition

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

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

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- Definition

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

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

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-Name Regulation S-X (SX)

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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-Publisher FASB

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- Definition

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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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.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ 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

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

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

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Long-Term Debt (Narrative) (Details) (USD $)	3 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended
Long-Term Debt (Narrative) (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014 pricing_tranch	May 15, 2013	Dec. 31, 2014	May 10, 2013
Debt Instrument [Line Items]
Long-term Debt	196,470,000us-gaap_LongTermDebt	630,256,000us-gaap_LongTermDebt		$ 196,470,000us-gaap_LongTermDebt
Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					280,000,000
Commitment fee, percentage	0.38%
Weighted average interest rate		3.20%
Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					100,000,000.0
Number Of Pricing Tranches		3
Variable Rate Senior Unsecured Note Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					50,000,000.0
Debt instrument, maturity year	2018
Long-term Debt	0	31,250,000		0
Standby Letters Of Credit [Member]
Debt Instrument [Line Items]
Letter of credit facility, amount	20,000,000
Line of Credit Facility, Amount Outstanding	9,500,000
6.09% Series A Senior Unsecured Notes Due 2016 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity year	2016
Debt instrument, interest rate	6.09%
Long-term Debt	0	21,000,000		0
7.26% Senior Unsecured Notes Due 2017 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity year	2017
Debt instrument, interest rate	7.26%
Long-term Debt	0	15,000,000		0
6.00% Series A Senior Unsecured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity year	2019
Debt instrument, interest rate	6.00%
Long-term Debt	0	47,000,000		0
6.21%Series B Senior Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity year	2021
Debt instrument, interest rate	6.21%
Long-term Debt	0	18,182,000		0
6.58% Series B Senior Unsecured Notes Due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity year	2022
Debt instrument, interest rate	6.58%
Long-term Debt	0	5,000,000		0
5.75% senior unsecured notes due 2018
Debt Instrument [Line Items]
Debt Instrument, Face Amount			300,000,000
Debt instrument, maturity year	2018
Debt instrument, maturity date			May 15, 2018
Debt Instrument, Issuance Date			May 15, 2013
Debt instrument, interest rate	5.75%		5.75%
Note Redeem Rate			100.00%
Note Repurchase Rate			101.00%
Long-term Debt	196,470,000	300,000,000		196,470,000
Ownership Percentage	100.00%
Debt Instrument, Repurchased Face Amount				103,500,000
Repayments of Long-term Debt				$ 107,200,000
Minimum \| Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
Debt Instrument [Line Items]
Commitment fee, percentage					0.25%
Minimum \| Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member]
Debt Instrument [Line Items]
Debt instrument maturity days		1 day
Minimum \| LIBOR [Member] \| Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate					2.00%
Minimum \| Agent's Base Rate [Member] \| Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate					0.50%
Maximum \| Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
Debt Instrument [Line Items]
Commitment fee, percentage					0.50%
Maximum \| Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member]
Debt Instrument [Line Items]
Debt instrument maturity days		30 days
Maximum \| LIBOR [Member] \| Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate					3.25%
Maximum \| Agent's Base Rate [Member] \| Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate					1.75%