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Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Long-Term Debt And Other Long-Term Liabilities (Narrative) (Details) (USD $)	0 Months Ended	9 Months Ended
	Sep. 13, 2011	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Credit facility maximum credit amount		$ 750,000,000
Credit facility maturity date		May 24, 2012
Commitment fee under credit facility standard	1.00%
Origination, agency and syndication fees		1,600,000
LIBOR interest rate plus one percent		LIBOR plus 1.00%
Outstanding borrowings		55,400,000		163,000,000
Outstanding borrowings subject to LIBOR		50,000,000
Payments of dividends exceeding percentage		30.00%
Current ratio of credit facility		1 to 1
Leverage ratio of long-term debt		4 to 1
6.625% senior subordinated notes due 2021		250,000,000		0
Interest percentage of senior subordinated notes		6.625%
Aggregate principal amount of debt		305,400,000		163,000,000
Debt instrument maturity date		2021
Proceeds from issuance of senior subordinated notes		243,950,000	0
Deducting fees for debt issuance		6,000,000
Repayment of outstanding borrowings under unsecured credit facility		220,300,000
Significant restrictions on received funds from subsidiaries		0
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%
2011		10,000,000
2012		16,900,000
2013		3,700,000
2014		3,000,000
2015		57,800,000
Line of credit facility lender determined amount [Member]
Credit facility current credit amount		600,000,000
Line of credit facility commitment amount [Member]
Credit facility current credit amount		$ 250,000,000
Senior Unsecured Credit Facility [Member]
Credit facility maturity date		September 13, 2016
Minimum [Member]
Commitment fee percentage under credit facility	0.375%
LIBOR plus interest rate		1.75%
Maximum [Member]
Commitment fee percentage under credit facility	0.50%
LIBOR plus interest rate		2.50%