Derivative Instruments Derivative gain loss (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Interest Rate Swap No. 2 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
5 yr Interest Rate Swap	$ 100	$ 0
Interest Rate Derivative Liabilities, at Fair Value	201	0
Interest Rate Swap No. 1 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
5 yr Interest Rate Swap	145	0
Interest Rate Derivative Liabilities, at Fair Value	881	0
Interest Rate Swap [Domain]
Derivative Instruments, Gain (Loss) [Line Items]
5 yr Interest Rate Swap	245	0
Interest Rate Derivative Liabilities, at Fair Value	$ 1,082	$ 0