Debt and Derivative Instruments (Summary of Interest Rate Swap Contracts Outstanding) (Details) $ in Thousands | 9 Months Ended |
Sep. 30, 2017USD ($) |
Derivative [Line Items] | | |
Derivative instrument, notional amount | $ 203,993 | |
Fair value of derivative assets measured on recurring basis | 3,841 | |
Derivative instrument, notional amount | 179,524 | |
Fair value of derivative liabilities measured on recurring basis | $ (1,207) | |
Interest Rate Swap One [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Apr. 7, 2015 | |
Derivative instrument, effective date | Apr. 7, 2015 | |
Derivative instrument, maturity date | Apr. 7, 2022 | |
Derivative instrument, pay fixed interest rate | 1.74% | [1] |
Derivative instrument, notional amount | $ 49,400 | |
Fair value of derivative assets measured on recurring basis | $ 235 | |
Interest Rate Swap Two [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Jul. 8, 2015 | |
Derivative instrument, effective date | Aug. 1, 2015 | |
Derivative instrument, maturity date | May 22, 2019 | |
Derivative instrument, pay fixed interest rate | 1.43% | [1] |
Derivative instrument, notional amount | $ 1,426 | |
Fair value of derivative assets measured on recurring basis | $ 3 | |
Interest Rate Swap Three [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Oct. 2, 2015 | |
Derivative instrument, effective date | Nov. 1, 2015 | |
Derivative instrument, maturity date | Nov. 1, 2022 | |
Derivative instrument, pay fixed interest rate | 1.79% | [1] |
Derivative instrument, notional amount | $ 13,100 | |
Fair value of derivative assets measured on recurring basis | $ 66 | |
Interest Rate Swap Four [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Jan. 25, 2016 | |
Derivative instrument, effective date | Feb. 1, 2016 | |
Derivative instrument, maturity date | Feb. 1, 2021 | |
Derivative instrument, pay fixed interest rate | 1.40% | [1] |
Derivative instrument, notional amount | $ 38,000 | |
Fair value of derivative assets measured on recurring basis | $ 446 | |
Interest Rate Swap Five [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Jun. 7, 2016 | |
Derivative instrument, effective date | Jul. 1, 2016 | |
Derivative instrument, maturity date | Jul. 1, 2023 | |
Derivative instrument, pay fixed interest rate | 1.42% | [1] |
Derivative instrument, notional amount | $ 43,680 | |
Fair value of derivative assets measured on recurring basis | $ 1,238 | |
Interest Rate Swap Six [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Jul. 21, 2016 | |
Derivative instrument, effective date | Aug. 1, 2016 | |
Derivative instrument, maturity date | Aug. 1, 2023 | |
Derivative instrument, pay fixed interest rate | 1.30% | [1] |
Derivative instrument, notional amount | $ 47,550 | |
Fair value of derivative assets measured on recurring basis | $ 1,716 | |
Interest Rate Swap Seven [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Aug. 29, 2016 | |
Derivative instrument, effective date | Oct. 21, 2016 | |
Derivative instrument, maturity date | Dec. 15, 2019 | |
Derivative instrument, pay fixed interest rate | 1.07% | [1] |
Derivative instrument, notional amount | $ 10,837 | |
Fair value of derivative assets measured on recurring basis | $ 137 | |
Interest Rate Swap Eight [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Jun. 27, 2014 | |
Derivative instrument, effective date | Jul. 1, 2014 | |
Derivative instrument, maturity date | Jul. 1, 2019 | |
Derivative instrument, pay fixed interest rate | 1.85% | [1] |
Derivative instrument, notional amount | $ 24,352 | |
Fair value of derivative liabilities measured on recurring basis | $ (109) | |
Interest Rate Swap Nine [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Jul. 31, 2014 | |
Derivative instrument, effective date | Jul. 31, 2014 | |
Derivative instrument, maturity date | Jul. 31, 2019 | |
Derivative instrument, pay fixed interest rate | 1.94% | [1] |
Derivative instrument, notional amount | $ 9,561 | |
Fair value of derivative liabilities measured on recurring basis | $ (59) | |
Interest Rate Swap Ten [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Sep. 17, 2015 | |
Derivative instrument, effective date | Sep. 17, 2015 | |
Derivative instrument, maturity date | Sep. 17, 2022 | |
Derivative instrument, pay fixed interest rate | 1.90% | [1] |
Derivative instrument, notional amount | $ 13,700 | |
Fair value of derivative liabilities measured on recurring basis | $ (7) | |
Interest Rate Swap Eleven [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Mar. 28, 2014 | |
Derivative instrument, effective date | Mar. 1, 2015 | |
Derivative instrument, maturity date | Mar. 28, 2019 | |
Derivative instrument, pay fixed interest rate | 2.22% | [1] |
Derivative instrument, notional amount | $ 5,525 | |
Fair value of derivative liabilities measured on recurring basis | $ (54) | |
Interest Rate Swap Twelve [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Feb. 11, 2015 | |
Derivative instrument, effective date | Mar. 2, 2015 | |
Derivative instrument, maturity date | Mar. 1, 2022 | |
Derivative instrument, pay fixed interest rate | 2.02% | [1] |
Derivative instrument, notional amount | $ 6,114 | |
Fair value of derivative liabilities measured on recurring basis | $ (45) | |
Interest Rate Swap Thirteen [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | May 23, 2014 | |
Derivative instrument, effective date | May 1, 2015 | |
Derivative instrument, maturity date | May 22, 2019 | |
Derivative instrument, pay fixed interest rate | 2.00% | [1] |
Derivative instrument, notional amount | $ 8,484 | |
Fair value of derivative liabilities measured on recurring basis | $ (59) | |
Interest Rate Swap Fourteen [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | May 8, 2014 | |
Derivative instrument, effective date | May 5, 2015 | |
Derivative instrument, maturity date | May 5, 2019 | |
Derivative instrument, pay fixed interest rate | 2.10% | [1] |
Derivative instrument, notional amount | $ 14,200 | |
Fair value of derivative liabilities measured on recurring basis | $ (119) | |
Interest Rate Swap Fifteen [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Jun. 6, 2014 | |
Derivative instrument, effective date | Jun. 1, 2015 | |
Derivative instrument, maturity date | May 8, 2019 | |
Derivative instrument, pay fixed interest rate | 2.15% | [1] |
Derivative instrument, notional amount | $ 11,684 | |
Fair value of derivative liabilities measured on recurring basis | $ (108) | |
Interest Rate Swap Sixteen [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Jun. 26, 2014 | |
Derivative instrument, effective date | Jul. 5, 2015 | |
Derivative instrument, maturity date | Jul. 5, 2019 | |
Derivative instrument, pay fixed interest rate | 2.11% | [1] |
Derivative instrument, notional amount | $ 20,725 | |
Fair value of derivative liabilities measured on recurring basis | $ (188) | |
Interest Rate Swap Seventeen [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Apr. 27, 2017 | |
Derivative instrument, effective date | Apr. 26, 2017 | |
Derivative instrument, maturity date | Apr. 26, 2022 | |
Derivative instrument, pay fixed interest rate | 1.91% | [1] |
Derivative instrument, notional amount | $ 24,479 | |
Fair value of derivative liabilities measured on recurring basis | $ (38) | |
Interest Rate Swap Eighteen [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Jun. 5, 2017 | |
Derivative instrument, effective date | May 31, 2017 | |
Derivative instrument, maturity date | May 15, 2022 | |
Derivative instrument, pay fixed interest rate | 1.90% | [1] |
Derivative instrument, notional amount | $ 14,700 | |
Fair value of derivative liabilities measured on recurring basis | $ (27) | |
Interest Rate Swap Nineteen [Member] | | |
Derivative [Line Items] | | |
Derivative instrument, date entered | Dec. 23, 2015 | |
Derivative instrument, effective date | Dec. 23, 2015 | |
Derivative instrument, maturity date | Jan. 2, 2026 | |
Derivative instrument, pay fixed interest rate | 2.30% | [1] |
Derivative instrument, notional amount | $ 26,000 | |
Fair value of derivative liabilities measured on recurring basis | $ (394) | |
|
[1] | Receive floating rate index based upon 1 month LIBOR. At September 30, 2017, the 1 month LIBOR was 1.23%. |