Derivative Financial Instruments - Fair Value of Derivatives (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 4,307,000	$ 0
Derivative Liability, Fair Value, Gross Liability	76,000	37,000
Derivative @ 2.087% 75K [Member]
Derivatives, Fair Value [Line Items]
Derivative, Inception Date	Apr. 15, 2014
Derivative, Maturity Date	Apr. 15, 2024
Derivative, Notional Amount	75,000
Derivative, Description of Variable Rate Basis	3 Month LIBOR
Derivative, Fixed Interest Rate	2.087%
Derivative Asset, Fair Value, Gross Asset	1,022,000	0
Derivative @ 2.088% 50K [Member]
Derivatives, Fair Value [Line Items]
Derivative, Inception Date	Apr. 15, 2014
Derivative, Maturity Date	Apr. 15, 2024
Derivative, Notional Amount	50,000
Derivative, Description of Variable Rate Basis	3 Month LIBOR
Derivative, Fixed Interest Rate	2.088%
Derivative Asset, Fair Value, Gross Asset	672,000	0
Derivative @ 2.479% 75K [Member]
Derivatives, Fair Value [Line Items]
Derivative, Inception Date	Aug. 01, 2015
Derivative, Maturity Date	Aug. 01, 2025
Derivative, Notional Amount	75,000
Derivative, Description of Variable Rate Basis	3 Month LIBOR
Derivative, Fixed Interest Rate	2.479%
Derivative Asset, Fair Value, Gross Asset	1,131,000	0
Derivative A @ 2.479% 50K [Member]
Derivatives, Fair Value [Line Items]
Derivative, Inception Date	Aug. 01, 2015
Derivative, Maturity Date	Aug. 01, 2025
Derivative, Notional Amount	50,000
Derivative, Description of Variable Rate Basis	3 Month LIBOR
Derivative, Fixed Interest Rate	2.479%
Derivative Asset, Fair Value, Gross Asset	729,000	0
Derivative B @ 2.479% 50K [Member]
Derivatives, Fair Value [Line Items]
Derivative, Inception Date	Aug. 01, 2015
Derivative, Maturity Date	Aug. 01, 2025
Derivative, Notional Amount	50,000
Derivative, Description of Variable Rate Basis	3 Month LIBOR
Derivative, Fixed Interest Rate	2.479%
Derivative Asset, Fair Value, Gross Asset	753,000	0
.76% Derivative [Member]
Derivatives, Fair Value [Line Items]
Derivative, Inception Date	Oct. 01, 2011
Derivative, Maturity Date	Sep. 01, 2014
Derivative, Notional Amount	9,000
Derivative, Description of Variable Rate Basis	1 Month LIBOR
Derivative, Fixed Interest Rate	0.76%
Derivative Liability, Fair Value, Gross Liability	$ 76,000	$ 37,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-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 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

+ Details

Name:	us-gaap_DerivativeFairValueOfDerivativeLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DerivativesFairValueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration