Derivative Instruments (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Gross notional amount related to interest rate swaps	$ 19,900,000.0invest_DerivativeNotionalAmount
Other Liabilities
Derivative [Line Items]
Fair value of interest rate swap	$ 3,000,000	$ 2,900,000

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.

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=35750535&loc=d3e13433-108611

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