Derivative Financial Instruments (Details)		1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 23, 2013	Apr. 30, 2014 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Interest Rate Swap Agreements			$ (55,000)	$ 0	$ (55,000)	$ 0
Derivative Liability [Abstract]
Derivative Liability			291,000		291,000		$ 871,000
Gain (Loss) Recognized in AOCI (Effective Portion)			0	(446,000)	57,000	(1,530,000)
Loss Reclassified from AOCI into Operations (Effective Portion)			(158,000)	(441,000)	(451,000)	(883,000)
Loss Recognized in Operations on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)			0	0	(30,000)	0
Net deferred losses on derivative instruments expected to be reclassified to operations during the next twelve months			300,000		300,000
Derivatives not designated as hedging instruments			$ 0		$ 0		0
Credit Facility 2011 - Term Loan B, As Amended 2013 [Member]
Derivatives
Debt Instrument, Variable Rate Basis Floor			0.75%		0.75%
Credit Facility 2011 - Term Loan B, As Amended 2013 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivatives
Debt Instrument, Description of Variable Rate Basis	LIBOR	LIBOR
Interest Rate Swap [Member]
Derivatives
Number of Interest Rate Derivatives Held		3
Derivative, Notional Amount		$ 200,000,000.0
Derivative Liability [Abstract]
Gain (Loss) Recognized in AOCI (Effective Portion)			$ 0	(446,000)	$ 57,000	(1,530,000)
Loss Reclassified from AOCI into Operations (Effective Portion)			(158,000)	(441,000)	(451,000)	(883,000)
Loss Recognized in Operations on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)			0	$ 0	(30,000)	$ 0
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Liability [Abstract]
Derivative Liability, Current			0		0		871,000
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative Liability [Abstract]
Derivative Liability, Current			$ 291,000		$ 291,000		$ 0