Interest Rate Swaps (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Derivative [Line Items]
Cumulative Fair Value of De-designated Cash Flow Hedges, Gross	$ (0.4)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0.9
Gain on Cash Flow Hedge Ineffectiveness	1.3
Interest Rate Swap 1 [Member]
Derivative [Line Items]
Interest rate swap agreement, notional amount	$ 75.0
Interest rate swap agreement, fixed interest rate	2.273%
Interest rate swap agreement, amendment date	Oct. 01, 2015
Interest rate swap agreement, termination date	Nov. 20, 2019
Interest rate swap agreement, effective date	Oct. 19, 2016
Interest Rate Swap 2 [Member]
Derivative [Line Items]
Interest rate swap agreement, notional amount	$ 25.0
Interest rate swap agreement, fixed interest rate	2.111%
Interest rate swap agreement, amendment date	Oct. 01, 2015
Interest rate swap agreement, termination date	Nov. 20, 2019
Interest rate swap agreement, effective date	Oct. 19, 2016
Interest Rate Swap 3 [Member]
Derivative [Line Items]
Interest rate swap agreement, notional amount	$ 50.0
Interest rate swap agreement, fixed interest rate	2.111%
Interest rate swap agreement, amendment date	Oct. 01, 2015
Interest rate swap agreement, termination date	Nov. 20, 2019
Interest rate swap agreement, effective date	Oct. 19, 2016