Fair Value Measurements (Details Textual) (Interest Rate Swap [Member])	Dec. 31, 2014	Dec. 31, 2013
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Swaption Interest Rate	4.17%	5.04%

Fixed interest rate that will be received or paid upon exercise of the interest rate swaption contract.

No definition available.

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