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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Fair Value Measurements [Line Items]
Cash and cash equivalents, Carrying Amount in Consolidated Balance Sheets	$ 64,013	$ 89,129	$ 72,746	$ 50,370
Goldman Sachs [Member]
Fair Value Measurements [Line Items]
Cash deposit for collateralized interest rate swap, Carrying Amount in Consolidated Balance Sheets	33,827	37,694
Carrying Amount in Consolidated Balance Sheets [Member]
Fair Value Measurements [Line Items]
Cash and cash equivalents, Carrying Amount in Consolidated Balance Sheets	64,013	89,129
Interest rate swap liability, Carrying Amount in Consolidated Balance Sheets	29,548	32,761
Fair Value [Member]
Fair Value Measurements [Line Items]
Cash and cash equivalents, Fair Value	64,013	89,129
Interest rate swap liability, Fair Value	29,548	32,761
Fair Value [Member] | Goldman Sachs [Member]
Fair Value Measurements [Line Items]
Cash deposit for collateralized interest rate swap, Fair Value	33,827	37,694
Fair Value, Level 1 [Member]
Fair Value Measurements [Line Items]
Cash and cash equivalents, Fair Value	64,013	89,129
Interest rate swap liability, Fair Value	0	0
Fair Value, Level 1 [Member] | Goldman Sachs [Member]
Fair Value Measurements [Line Items]
Cash deposit for collateralized interest rate swap, Fair Value	33,827	37,694
Fair Value, Level 2 [Member]
Fair Value Measurements [Line Items]
Cash and cash equivalents, Fair Value	0	0
Interest rate swap liability, Fair Value	29,548	32,761
Fair Value, Level 2 [Member] | Goldman Sachs [Member]
Fair Value Measurements [Line Items]
Cash deposit for collateralized interest rate swap, Fair Value	0	0
Fair Value, Level 3 [Member]
Fair Value Measurements [Line Items]
Cash and cash equivalents, Fair Value	0	0
Interest rate swap liability, Fair Value	0	0
Fair Value, Level 3 [Member] | Goldman Sachs [Member]
Fair Value Measurements [Line Items]
Cash deposit for collateralized interest rate swap, Fair Value	$ 0	$ 0

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure. This item represents the aggregate of all deposit assets held by the entity for interest rate swaps.

+ References

No definition available.

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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-Publisher FASB

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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 02

-Paragraph 1

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

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-Paragraph 8

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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