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Financial Instruments and Fair Values - Terms of Agreements and Fair Value (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Feb. 28, 2017 | Dec. 31, 2016
Derivatives, Fair Value [Line Items] |  |  |  |
Loss from derivative financial instruments | $ 247,000 | $ 0 |  |
Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset | 1,547,000 |  |  | $ 614,000
Liability | (5,234,000) |  |  | (5,591,000)
LIBOR | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, One Month LIBOR, 2.1485% |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 265,000,000 |  |  |
Pay Rate | 2.1485% |  |  |
Asset | $ 0 |  |  | 0
Liability | (1,483,000) |  |  | (1,634,000)
LIBOR | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, Three Month LIBOR, 2.5050% |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 100,000,000 |  |  |
Pay Rate | 2.505% |  |  |
Asset | $ 0 |  |  | 0
Liability | (649,000) |  |  | (684,000)
LIBOR | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, Three Month LIBOR, 2.5050%, 2 |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 80,000,000 |  | $ 100,000,000.0 |
Pay Rate | 2.505% |  |  |
Asset | $ 0 |  |  | 0
Liability | (520,000) |  |  | (685,000)
Notional amount, terminated | 20,000,000 |  |  |
LIBOR | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, Three Month LIBOR, 2.4860% |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 100,000,000 |  |  |
Pay Rate | 2.486% |  |  |
Asset | $ 230,000 |  |  | 224,000
Liability | 0 |  |  | 0
LIBOR | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, Three Month LIBOR, 2.4860%, 2 |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 100,000,000 |  |  |
Pay Rate | 2.486% |  |  |
Asset | $ 228,000 |  |  | 223,000
Liability | 0 |  |  | 0
LIBOR | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, Three Month LIBOR, 2.4860%, 3 |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 75,000,000 |  |  |
Pay Rate | 2.486% |  |  |
Asset | $ 172,000 |  |  | 167,000
Liability | 0 |  |  | 0
LIBOR | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, Three Month LIBOR, 2.7620% |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 75,000,000 |  |  |
Pay Rate | 2.762% |  |  |
Asset | $ 0 |  |  | 0
Liability | (1,292,000) |  |  | (1,295,000)
LIBOR | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, Three Month LIBOR, 2.7620%, 2 |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 75,000,000 |  |  |
Pay Rate | 2.762% |  |  |
Asset | $ 0 |  |  | 0
Liability | (1,290,000) |  |  | (1,293,000)
LIBOR | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, Three Month LIBOR, 2.4625% |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 100,000,000 |  |  |
Pay Rate | 2.46245% |  |  |
Asset | $ 917,000 |  |  | 0
Liability | 0 |  |  | $ 0
Other expense | LIBOR | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, Three Month LIBOR, 2.5050%, 2 |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Loss from derivative financial instruments | $ 200,000 | $ 0 |  |

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