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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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