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Financial Instruments and Fair Values - Terms of Agreements and Fair Value (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |  |
Reclassification into earnings as an increase to interest expense | $ 1,500,000 |  |  |
Term of reclassification | 10 years |  |  |
Loss from derivative financial instruments | $ 289,000 | $ 0 | $ 0 |
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset | 0 | 614,000 |  |
Liability | (436,000) | (5,591,000) |  |
LIBOR [Member] | Interest Rate Swap, One Month LIBOR, 2.1485% [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 265,000,000 |  |  |
Pay Rate | 2.1485% |  |  |
Asset | $ 0 | 0 |  |
Liability | (436,000) | (1,634,000) |  |
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.5050% [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 100,000,000 |  |  |
Pay Rate | 2.505% |  |  |
Asset | $ 0 | 0 |  |
Liability | 0 | (684,000) |  |
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.5050%, 2 [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 80,000,000 |  |  | $ 100,000,000.0
Pay Rate | 2.505% |  |  |
Asset | $ 0 | 0 |  |
Liability | 0 | (685,000) |  |
Notional amount, terminated |  |  |  | $ 20,000,000
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.4860% [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 100,000,000 |  |  |
Pay Rate | 2.486% |  |  |
Asset | $ 0 | 224,000 |  |
Liability | 0 | 0 |  |
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.4860%, 2 [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 100,000,000 |  |  |
Pay Rate | 2.486% |  |  |
Asset | $ 0 | 223,000 |  |
Liability | 0 | 0 |  |
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.4860%, 3 [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 75,000,000 |  |  |
Pay Rate | 2.486% |  |  |
Asset | $ 0 | 167,000 |  |
Liability | 0 | 0 |  |
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.7620% [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 75,000,000 |  |  |
Pay Rate | 2.762% |  |  |
Asset | $ 0 | 0 |  |
Liability | 0 | (1,295,000) |  |
LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.7620%, 2 [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 75,000,000 |  |  |
Pay Rate | 2.762% |  |  |
Asset | $ 0 | 0 |  |
Liability | 0 | (1,293,000) |  |
LIBOR [Member] | Two Interest Rate Swaps, Three Month LIBOR, 2.5050% [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Deferred losses on terminated hedges | 15,100,000 |  |  |
Other Nonoperating Income (Expense) [Member] | LIBOR [Member] | Interest Rate Swap, Three Month LIBOR, 2.5050%, 2 [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Loss from derivative financial instruments | $ 300,000 | $ 0 | $ 0 |

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