Debt Interest Rate Swaps 2 (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Derivative [Line Items]
Cumulative fair value of de-designated cash flow hedges, gross	$ (3,665)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ 400
Interest Rate Swap 6, Credit Facility [Member]
Derivative [Line Items]
Interest rate swap agreement, amendment date	Oct. 01, 2015
Interest rate swap agreement, effective date	Oct. 19, 2016
Interest rate swap agreement, notional amount	$ 75,000
Interest rate swap agreement, fixed interest rate	2.273%
Interest rate swap agreement, termination date	Nov. 20, 2019
Interest Rate Swap 7, Credit Facility [Member]
Derivative [Line Items]
Interest rate swap agreement, amendment date	Oct. 01, 2015
Interest rate swap agreement, effective date	Oct. 19, 2016
Interest rate swap agreement, notional amount	$ 25,000
Interest rate swap agreement, fixed interest rate	2.111%
Interest rate swap agreement, termination date	Nov. 20, 2019
Interest Rate Swap 8, Credit Facility [Member]
Derivative [Line Items]
Interest rate swap agreement, amendment date	Oct. 01, 2015
Interest rate swap agreement, effective date	Oct. 19, 2016
Interest rate swap agreement, notional amount	$ 50,000
Interest rate swap agreement, fixed interest rate	2.111%
Interest rate swap agreement, termination date	Nov. 20, 2019