Long-Term Debt And Other Long-Term Liabilities (Narrative) (Details) (USD $)	3 Months Ended
Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt	$ 645,800,000	$ 645,700,000
Credit facility maximum credit amount	900,000,000
Commitment fee under credit facility standard	1.00%
Credit facility maturity date	9/13/2016
Origination, agency and syndication and other related fees with the credit agreement	1,500,000
Payable assessment term for LIBOR	90 days
LIBOR interest rate plus one percent	LIBOR plus 1.00%
Line of credit facility, amount outstanding	0	0
Current ratio of credit facility	1 to 1
Leverage ratio of long-term debt	4 to 1
Interest percentage of senior subordinated notes	6.625%
Debt instrument maturity date	May 15, 2021
Original debt issuance fees	14,700,000
Percentage of maximum, aggregate principal equity amount	35.00%
Proceed from equity offerings redemption price percentage	106.625%
Minimum redemption percentage of debt outstanding	65.00%
Equal redemption price percentage of principal amount of debt	100.00%
Senior notes repurchase price in percentage	101.00%
Estimated principal payments in 2014	11,600,000
Estimated principal payments in 2015	36,000,000
Estimated principal payments in 2016	5,700,000
Estimated principal payments in 2017	3,700,000
Estimated principal payments in 2018	3,600,000
Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage under credit facility	0.375%
LIBOR plus interest rate	1.75%
Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage under credit facility	0.50%
LIBOR plus interest rate	2.50%
Maximum payment of dividends as a percentage of consolidated net income, prohibited under credit agreement	30.00%
6.625% Senior Subordinated Notes Due 2021 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	650,000,000
Line Of Credit Facility Lender Determined Amount [Member]
Debt Instrument [Line Items]
Credit facility current credit amount	900,000,000	800,000,000
Line Of Credit Facility Commitment Amount [Member]
Debt Instrument [Line Items]
Credit facility current credit amount	$ 500,000,000

Commitment Fee Under Credit Facility Standard

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- Definition

Current ratio of credit facility.

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No definition available.

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- Definition

Debt Instrument, Variable Interest Rate, Payable Assessment Period

+ References

No definition available.

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- Definition

Equal redemption price percentage of principal amount of debt.

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No definition available.

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- Definition

Estimated annual payments, long term debt and other liabilities, due in the next twelve months.

+ References

No definition available.

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- Definition

Estimated annual payments, long term debt and other liabilities, due in year five.

+ References

No definition available.

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- Definition

Estimated annual payments, long term debt and other liabilities, due in year four.

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No definition available.

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- Definition

Estimated annual payments, long term debt and other liabilities, due in year three.

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No definition available.

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- Definition

Estimated annual payments, long term debt and other liabilities, due in year two.

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No definition available.

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- Definition

Interest rate in addition to LIBOR.

+ References

No definition available.

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- Definition

Leverage ratio of long term debt to consolidated EBITDA.

+ References

No definition available.

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- Definition

Loan origination fees paid to date. These fees are being amortized over the life of the agreement.

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No definition available.

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- Definition

Minimum redemption percentage of debt outstanding.

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No definition available.

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- Definition

Credit facility prohibits the payment of dividends over 0.25 of cni for preceding fiscal year.

+ References

No definition available.

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- Definition

Percentage of maximum aggregate principal equity amount of the original principal amount that can be redeemed.

+ References

No definition available.

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- Definition

Proceed from equity offerings redemption price percentage.

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No definition available.

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- Definition

Senior notes repurchase price in percentage for change of control.

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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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-SubTopic 30

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- Definition

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

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-Publisher SEC

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-Number 210

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- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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

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- Definition

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

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-Number 210

-Section 02

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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.

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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.

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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

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

Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis.

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The total of the cash outflow during the period which has been paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt and the cost incurred directly for the issuance of equity securities.

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-Glossary Financing Activities

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