Fair Value of Financial Instruments (Interest Rate Swaps) (Details) - Derivatives designed as hedging instruments	Jun. 30, 2018 USD ($)
Bank of Montreal | Interest Rate Swap Maturing 1/31/2019
Derivatives, Fair Value [Line Items]
Notional Amount	$ 50,000,000
Bank of Montreal | Interest Rate Swap Maturing 8/31/2022
Derivatives, Fair Value [Line Items]
Notional Amount	100,000,000
Regions Bank | Interest Rate Swap Maturing 1/31/2019
Derivatives, Fair Value [Line Items]
Notional Amount	50,000,000
U.S. Bank | Interest Rate Swap Maturing 8/31/2022
Derivatives, Fair Value [Line Items]
Notional Amount	$ 100,000,000