Derivative Instruments and Hedging Activities (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Estimated reclassification of derivative gain (loss) from AOCI to earnings	$ 200,000
Interest Rate Swap
Derivative [Line Items]
Fair value of derivative instrument	400,000	$ 400,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Hedge December 2016
Derivative [Line Items]
Total notional amount	$ 50,000,000	$ 50,000,000
Fixed interest rate	1.59%	1.59%
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Hedge June 2018
Derivative [Line Items]
Total notional amount	$ 20,000,000	$ 20,000,000
Fixed interest rate	2.98%	2.98%
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount increase upon maturity	$ 70,000,000