Debt (Schedule of Interest Rate Derivatives) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Interest Rate Swap, Date Entered, May 2012 [Member]
Derivative [Line Items]
Derivative, Inception Date	May 31, 2012
Derivative, Maturity Date	Apr. 30, 2019
Derivative, Fixed Interest Rate	2.84%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 40,000
Interest Rate Cash Flow Hedge Liability at Fair Value	$ 15
Interest Rate Swap, Date Entered, June 2013 [Member]
Derivative [Line Items]
Derivative, Inception Date	Jun. 30, 2013
Derivative, Maturity Date	Jun. 30, 2020
Derivative, Fixed Interest Rate	3.41%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 80,000
Interest Rate Cash Flow Hedge Liability at Fair Value	$ 886
Interest Rate Swap, Date Entered, March 2014 [Member]
Derivative [Line Items]
Derivative, Inception Date	Mar. 31, 2014
Derivative, Maturity Date	Jun. 30, 2020
Derivative, Fixed Interest Rate	3.46%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 130,000
Interest Rate Cash Flow Hedge Liability at Fair Value	$ 1,606