When the derivative or group of derivatives presented is a swap, the type of interest rate (fixed, variable, stepped, etc.) paid on the swap.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column A

-Footnote 1

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- Definition

Last date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

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- Definition

First date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

Aggregate forecasted notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

+ References

No definition available.

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- Definition

Fixed interest rate related to the interest rate derivative.

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No definition available.

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611

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Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

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Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified							1 Months Ended
	Mar. 31, 2013 Not Designated as Hedging Instrument [Member]	Dec. 31, 2012 Not Designated as Hedging Instrument [Member]	Mar. 31, 2013 Pay Fixed / Receive Variable Swaps [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2012 Pay Fixed / Receive Variable Swaps [Member] Not Designated as Hedging Instrument [Member]	Mar. 31, 2013 Pay Variable / Receive Fixed Swaps [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2012 Pay Variable / Receive Fixed Swaps [Member] Not Designated as Hedging Instrument [Member]	Apr. 30, 2013 Interest Rate Swap October 2015 March 2019 [Member] Designated as Hedging Instrument [Member] Subsequent Event [Member]	Apr. 30, 2013 Interest Rate Swap April 2015 April 2017 [Member] Designated as Hedging Instrument [Member] Subsequent Event [Member]	Apr. 30, 2013 Interest Rate Swap October 2015 October 2019 [Member] Designated as Hedging Instrument [Member] Subsequent Event [Member]	Apr. 30, 2013 Interest Rate Swap April 2016 April 2020 [Member] Designated as Hedging Instrument [Member] Subsequent Event [Member]	Apr. 30, 2013 Interest Rate Swap April 2016 April 2022 [Member] Designated as Hedging Instrument [Member] Subsequent Event [Member]	Apr. 30, 2013 Interest Rate Swap October 2016 October 2020 [Member] Designated as Hedging Instrument [Member] Subsequent Event [Member]
Interest rate swap agreements [Abstract]
Notional Amount of Interest rate swap	$ 477,672	$ 472,754	$ 238,836	$ 236,377	$ 238,836	$ 236,377
Estimated Fair Value of Interest rate swap	(291)	(234)	15,709	16,132	(16,000)	(16,366)
Forward Cash Flow Hedge Relationship [Abstract]
Forecasted Notional Amount							$ 33,000	$ 33,000	$ 33,000	$ 33,000	$ 34,000	$ 34,000
Variable Interest Rate							3 month LIBOR	3 month LIBOR	3 month LIBOR	3 month LIBOR	3 month LIBOR	3 month LIBOR
Fixed Interest Rate							1.857%	1.428%	1.996%	2.265%	2.646%	2.523%
Term, Lower Maturity Range Date							Oct. 31, 2015	Apr. 30, 2015	Oct. 31, 2015	Apr. 30, 2016	Apr. 30, 2016	Oct. 31, 2016
Term, Higher Maturity Range Date							Mar. 31, 2019	Apr. 30, 2017	Oct. 31, 2019	Apr. 30, 2020	Apr. 30, 2022	Oct. 31, 2020