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Derivative Financial Instruments - Fair Value of Derivatives (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Jul. 13, 2016 | Dec. 31, 2015
Derivatives, Fair Value [Line Items] |  |  |
Document Fiscal Year Focus | 2016 |  |
Current Fiscal Year End Date | --12-31 |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | $ 91,618,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 62,187,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | $ 125,205,000 |  |
Derivative @ 1.048% 200K [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Inception Date | Aug. 01, 2016 |  |
Derivative, Maturity Date | Jan. 05, 2022 |  |
Derivative, Notional Amount | $ 200,000,000 |  |
Derivative, Underlying Basis | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate | 1.0477% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ 7,538,000 |  | $ 0
Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount | $ 220,000,000 |  |
Derivative @ 1.070% 65K [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Inception Date | Aug. 01, 2016 |  |
Derivative, Maturity Date | Jan. 05, 2022 |  |
Derivative, Notional Amount | $ 65,000,000 |  |
Derivative, Underlying Basis | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate | 1.07% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ 2,351,000 |  | 0
Derivative @ 2.196% 28.1K [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Inception Date | Oct. 16, 2013 |  |
Derivative, Maturity Date | Oct. 16, 2020 |  |
Derivative, Notional Amount | $ 28,100,000 |  |
Derivative, Underlying Basis | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate | 2.196% |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | $ (580,000) |  | (898,000)
Derivative @ 1.30250% 20.0M [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Inception Date | Apr. 07, 2016 |  |
Derivative, Maturity Date | Apr. 01, 2023 |  |
Derivative, Notional Amount | $ 20,000,000 |  |
Derivative, Underlying Basis | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate | 1.3025% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ 720,000 |  | 0
Derivative @ 1.490% 33.0M [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Inception Date | Dec. 01, 2016 |  |
Derivative, Maturity Date | Nov. 01, 2023 |  |
Derivative, Notional Amount | $ 33,000,000 |  |
Derivative, Underlying Basis | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate | 1.49% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ 1,013,000 |  | 0
Derivative @ 3.488% 20K [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Inception Date | Jun. 15, 2017 |  |
Derivative, Maturity Date | Jun. 15, 2027 |  |
Derivative, Early Termination Date | Dec. 15, 2017 |  |
Derivative, Notional Amount | $ 20,000,000 |  |
Derivative, Underlying Basis | 3 Month LIBOR |  |
Derivative, Fixed Interest Rate | 3.4875% |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | $ 0 |  | (1,798,000)
Derivative @ 3.48% 100K [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Inception Date | Jun. 15, 2017 |  |
Derivative, Maturity Date | Jun. 15, 2027 |  |
Derivative, Early Termination Date | Dec. 15, 2017 |  |
Derivative, Notional Amount | $ 100,000,000 |  |
Derivative, Underlying Basis | 3 Month LIBOR |  |
Derivative, Fixed Interest Rate | 3.48% |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | $ 0 |  | (8,922,000)
Derivative @ 3.48% 100K 2 [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Inception Date | Jun. 15, 2017 |  |
Derivative, Maturity Date | Jun. 15, 2027 |  |
Derivative, Early Termination Date | Dec. 15, 2017 |  |
Derivative, Notional Amount | $ 100,000,000 |  |
Derivative, Underlying Basis | 3 Month LIBOR |  |
Derivative, Fixed Interest Rate | 3.48% |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | $ 0 |  | (8,921,000)
Fair Value, Measurements, Recurring [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | 11,622,000 |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | (580,000) |  | (20,539,000)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net | (11,042,000) |  | (20,539,000)
Interest Rate Cash Flow Hedge Asset at Fair Value | 11,622,000 |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | (580,000) |  | $ (20,539,000)
Unsecured Debt [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Unsecured Debt Repayment |  | $ 300,000,000 |
Unsecured Debt [Member] | Unsecured Maturities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 0 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 0 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | $ 15,000,000 |  |

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