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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Fair Value Measurements [Line Items]
Cash and cash equivalents, Carrying Amount in Consolidated Balance Sheets	$ 122,256	$ 93,424	$ 119,243	$ 103,003
Goldman Sachs [Member]
Fair Value Measurements [Line Items]
Cash deposit for collateralized interest rate swap, Carrying Amount in Consolidated Balance Sheets		26,130
Carrying Amount in Consolidated Balance Sheets [Member]
Fair Value Measurements [Line Items]
Cash and cash equivalents, Carrying Amount in Consolidated Balance Sheets	122,256	93,424
Interest rate swap liability, Carrying Amount in Consolidated Balance Sheets	23,106	21,734
Fair Value [Member]
Fair Value Measurements [Line Items]
Cash and cash equivalents, Fair Value	122,256	93,424
Interest rate swap liability, Fair Value	23,106	21,734
Fair Value [Member] | Goldman Sachs [Member]
Fair Value Measurements [Line Items]
Cash deposit for collateralized interest rate swap, Fair Value	27,335	26,130
Fair Value, Level 1 [Member]
Fair Value Measurements [Line Items]
Cash and cash equivalents, Fair Value	122,256	93,424
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	27,335	26,130
Fair Value, Level 2 [Member]
Fair Value Measurements [Line Items]
Cash and cash equivalents, Fair Value	0	0
Interest rate swap liability, Fair Value	23,106	21,734
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.

+ Details

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X

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SX 210.5-02.1)
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- Definition

Fair value portion 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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6506951

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 4H
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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 55
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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.

+ References

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